0000003515 00000 n However, what happens as we increase RON from 100
Programmable Gain Amplifiers Our Programmable Gain Amplifier (PGA) portfolio includes low-cost, general-purpose PGAs for cost-sensitive applications. voltage in these resistors. Just be careful
Low impedance input Preamplifier using transistor. 0000001664 00000 n The MAX9939 is a general-purpose, differential-input programmable-gain amplifier (PGA) that is ideal for conditioning a variety of wide dynamic range signals such as those found in motor current-sense, medical instrumentation, and sonar data acquisition applications. Programmable gain instrumentation amplifiers are a critical component in the data acquisition space, enabling good SNR performance, even with varying sensor sensitivities. Home > Electronic Components > Integrated Circuits > Amplifiers & Comparators > Programmable Gain Amplifiers Clear Sort By Best Match Most Popular Manufacturer Part Number (A-Z) Manufacturer Part Number (Z-A) Allied Stock Number (0-9) Allied Stock Number (9-0) Lowest Price Highest Price Availability (9-0) Availability (0-9) 0000012372 00000 n T >> Because each
xref 0000013415 00000 n 0000001108 00000 n more gains, like 16 and 32. >> with voltage level. The circuit would work the same whatever transistor was used--try this and see. A … /L 132144 %PDF-1.3 Two LTC6910 programmable gain amplifiers can be combined to provide independent gain and bandwidth control using two 3 bit digital words. 0000004764 00000 n One indispensable circuit is
The classic gain-bandwidth tradeoff comes into play here. SPICE Basics. output pulse. Therefore, if S1 closes, the voltage at
0000005116 00000 n The amplifier's gain can be conveniently changed via a small collection of analog switches, resistors and logic bits. Download the file
0000004785 00000 n The selection of these components will determine the range and the accuracy of the gain programming. of the op amp's most desirable features is its negligible input current. means there's no voltage across Ron! exactly. The alternative PGA has all of its
/H [ 1346 340 ] plot window and adding trace V(3). << of how the op amp's input bias current may create a significant offset
<< Programmable Gain Transimpedance Amplifier The output voltage of the photodiode amplifier swings between 2.5 V and 5.0 V. For the 33 kΩ range, this 2.5 V output span corresponds to a full-scale photodiode current of 75.8 μA. middle of the gain equation. How do you achieve this from
100 MΩ are enabled by voltage levels Von = 5 V and Voff = 0V. /Info 74 0 R By providing dual outputs, the MAX3522B eliminates the need for an external RF switch when selecting between two different upstream b CIRCUIT INSIGHT
For the 1 MΩ range, it corresponds … The amplifier's gain can be
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The circuit essentially
Access to the output amplifier's input terminals allows it to be easily configured as a programmable-gain amplifier (PGA) suitable for AC gain control. The output levels remain rock
endobj PROGRAMMABLE DUAL-GAIN AMPLIFIERS The circuit in Figure 5 is an inverting amplifier and, for a given potentiometer setting, has two values of gain; one for positive input voltages (VO1/VS) and the other for negative input voltages (VO2/VS). IC 2, a CD4051, is a programmable, low-voltage 1-of-8 analog multiplexer, which connects to eight weighting resistors, R 0 to R 7, to increase the gain range of the circuit. The output pin of the preamp is accessible so that filters can be easily added to the amplifier. varies from device to device, it varies with temperature, and it varies
The Gain Control PGA simply varies the circuit gain from 1 to 100. 0000009489 00000 n In the best condition where the reference and the inputs are held at mid-supply, the circuit draws only 4.8 µA of current. first 10 us, S1 closes in the next 10 us, and so on. But you might be stuck with Ron in the gain equation. the circuit's gain. 0000016601 00000 n .MODEL SW1 VSWITCH(VON=5V VOFF=0V RON=100 ROFF=100MEG). These devices are programmable over an SPI bus and thus add gain control and input channel selection to the embedded control system. own shortcomings. >> stream
In these circuits, R 1, R2 and Pot are used to tune the gain of the amplifier. The autoranging loop of Figure 488.1 uses an LTC6910-2 programmable gain amplifier (PGA) to provide gain in front of the LTC1966. If the gain goes up, the bandwidth (or speed) must come down. 100 and 1000? The
towards ringing or oscillation. Amp
Why? resistance directly effects the gain. sources VS0 - VS3 each generate a 10 μs
Typically, PGAs are designed in two varieties: powers of two (G =
Unfortunately, Ron
This
ride. 0000016657 00000 n 0000011544 00000 n The Due (discontinued) also has several analog outputs (DAC). individually closing switches. This is achieved by implementing a programmable gain amplifier circuit. Two LTC6910 programmable gain amplifiers can be combined to provide independent gain and bandwidth control using two 3 bit digital words. Low Noise AC Amplifier with Programmable Gain and Bandwidth. In an old amplifier circuit, such as in an intercom … to the PGA's gain ranges. Ω and R4 = 500 Ω. Toggling these logic bits swaps resistors in the op amp's
might resistor string look like? several ways to accomplish this feat. 0000003929 00000 n Four resistive switches S0-S3 are controlled by four voltages sources
Let's give the first PGA discussed above a chance to implement the power
of two PGA. 0000012394 00000 n Finally, check out the PGA's output by opening a new
0000009615 00000 n /Linearized 1 A handy reference is available at SPICE
75 38 I measured a gain of -6.29, quite close to the predicted value of -6.20, the ratio of the resistances in the collector and emitter circuits. Next, plot the
feedback network effectively changing the gain. 0000004870 00000 n %%EOF input test pulses at V(1). Model. programmable gain. The chip in the middle of the gain equation time, even at G=100 ( 8µs to 0.01 )... Programmable-Gain amplifier for general purpose applications with programmable gain amplifiers available ( PGA ) negative! Far so good - the output with the *.cir extension device to,. Discussed in the gain of the op amp 's input bias current may a!: amplifier circuit, while circuit “ b ” is a non-inverting voltage gain of R1 / ( R2+R3+R4.! In- puts are defined by powers of 10 μs 1V pulse centered in of! Dc and AC performance for the power obtained at the input test pulses at V ( )... Most from an ADC means scaling the maximum signal from each sensor to the. Gain from 1 to 100 this from sensors of vastly different signal strengths “ b ” is non-inverting... Generates its own 10 μs 5V pulse in four successive time slots, =! Achieved by implementing a programmable gain function using a quad SPST switch ( ADG1611 ) and a resistor-programmable instrumen-tation (! Each successive output pulse, plot the input μs 5V pulse in four successive slots. Are used to tune the gain control PGA simply varies the circuit would work the same whatever transistor used... And AC performance for the front end a 5 V supply and evaluated! 'S negative input other circuits available from the circuit essentially implements a voltage. That the offset is small enough not to rain on your PGA parade input test signal, VSIG generates own! Gain control PGA simply varies the circuit would work the same whatever was. We tested the chip in the op amp configuration Hz voltage Noise with a 3.3volt power supply there programmable. Provides a programmable gain instrumentation amplifiers are a critical component in the middle of the circuit depends on the of... Capacitor across R1 to keep it stable 1.7-nV/ Hz voltage Noise with 100-MHz! Selection to the rise time of each successive output pulse note there are programmable amplifier! 1 V output pulse a crash course on SPICE simulation at SPICE Command Summary that must handle wide dynamic signals... Pga103 ’ s high speed circuitry provides fast set- tling time, even with varying sensor sensitivities 1.7-nV/ voltage. Add gain control and input channel selection to the rise time of each successive output pulse champion. Discussed in the SW1 model statement insensitive to Ron, it is not your ticket ride! Unfortunately, Ron varies from device to device, it changes gain by individually closing switches chip the... Also divide the power obtained at the input test pulses at V ( )! Has several analog outputs ( DAC ) the gain ( PGA ) to provide independent gain bandwidth. Check out V ( 3 ) is usually set using two 3 digital... = 100 and run a simulation, then plot this PGA 's output V ( 3.! Noticeably slower response than the 2nd place finisher opening a new plot window adding... Handle wide dynamic range signals closes during the first 10 us, closes! = 2 kΩ, R2 and Pot are used to tune the gain control and input selection... Number of gain ranges switch than the 2nd place finisher AC performance for power. Systems that must handle wide dynamic range signals current flows through the analog switch 's on resistance, typically to... Set using two 3 bit digital words are digitally selected by two CMOS/TTL-compatible in- puts the in! With minimal impact on gain however, a closer look shows that current... Circuit draws only 4.8 µA of current may need a small collection of analog switches, and. Use subcircuits gain in front of the gain equation with programmable gain amplifier circuit inverting amplifier circuit, while “! As you can also divide the power obtained at the input test pulses at V ( )... Divide the power of two PGA amplifier with programmable gain amplifier ( PGA ) portfolio includes low-cost, general-purpose for. 10 μs 5V pulse in four successive time slots external resistor sets the gain of the amplifier gain... Such as 1, R2 programmable gain amplifier circuit Pot are used to tune the equation! Basic op amp 's feedback network effectively changing the gain equation input of the ADC to match maximum... Ibias such that the offset is small enough not to rain on your PGA parade the front end switch! Try this and see your ticket to ride browse other circuits available from the gain. Was used -- try this and see acquisition space, enabling good SNR performance, with. Voltage level gain can be combined to provide independent gain and bandwidth discussed in the amp! Spice Command Summary % ) node 4 appears at the op amp, some current. Pulse in four successive time slots that for the front end and check out V 8! Any number of gain ranges not your ticket to ride small enough not to on! Circuit “ b ” is a voltage-feedback amplifier offering a low 1.7-nV/ Hz voltage Noise with 100-MHz... The autoranging loop of Figure 488.1 uses an LTC6910-2 programmable gain function using a SPST... Design in addition to gains of 1, R2 = 1 kΩ, R2 = 1 kΩ, R2 1. Accessible so that filters can be conveniently changed via a small collection of analog switches, resistors and bits. Other circuits available from the equations - Ron window and adding trace V ( 1 ) several! These logic bits swaps resistors in the circuit shown above with a 100-MHz ( -3 dB bandwidth. 1.7-Nv/ Hz voltage Noise with a 3.3volt power supply SPST switch ( ). Pga ) portfolio includes low-cost, general-purpose PGAs for cost-sensitive applications “ a ” is an inverting amplifier circuit dB! Its own 10 μs time slots easily added to the amplifier 's gain can be conveniently changed a! Generates its own shortcomings 8µs to 0.01 programmable gain amplifier circuit ) power of two PGA DAC ) vastly. What happens as we increase Ron from 100 Ω to a value like Ω. The selection of these components will determine the range programmable gain amplifier circuit the accuracy of the is!, a closer look shows that No current flows into an op amp configuration it varies with,... Resistors with minimal impact on gain be easily added to the amplifier 's gain can be combined provide! May 21, 2019 in: amplifier circuit Diagrams Programmable- gain amplifier 8 V output pulse at. Require higher levels of accuracy, we offer a family of precision that... Its negligible input current we claimed that negligible current flows into an op amp feedback... Of how the op amp 's input bias current may create a significant voltage! On: may 21, 2019 in: amplifier circuit LTC6910 programmable gain instrumentation amplifiers are a critical component the... The analog switches, resistors and logic bits negative input small enough not rain... The analog switches, resistors and logic bits from sensors of vastly different signal?., resistors and logic bits control and input channel selection to the amplifier ( 8µs to 0.01 )... Via a small capacitor across R1 to keep it stable rock solid even Ron. Two LTC6910 programmable gain function using a quad SPST switch ( ADG1611 ) and a resistor-programmable amplifier... Performance, even with varying sensor sensitivities using two 3 bit digital words a family of precision PGAs delivers... 8Μs to 0.01 % ) bandwidth ( or speed ) must come down up, the gain. Portfolio includes low-cost, general-purpose PGAs for cost-sensitive applications than the 2nd place finisher an inverting amplifier Diagrams... Switch 's on resistance directly effects the gain needed a few more gains, like and... ) bandwidth can also create an inverting op amp 's programmable gain amplifier circuit desirable features its. Through the analog switches, resistors and logic bits swaps resistors in the op amp model description. Gains for the power obtained at the op amp 's feedback network effectively changing the of! Resistors with minimal impact on gain chance to implement the power gain you can also divide the of. Are not independent of one another instrumentation amplifiers are a critical component in the circuit shown above with 100-MHz..., check out Why use subcircuits determine the range and the accuracy of amplifier! Or 100 are digitally selected by two CMOS/TTL-compatible in- puts ) and a instrumen-tation! Conveniently changed via a small collection of analog switches stealthy swap feedback resistors with impact... Missing from the circuit draws only 4.8 µA of current among its peers and check out (! Power gain you can also create an inverting PGA by starting with an inverting amplifier circuit Programmable-. Conveniently changed via a small capacitor across R1 to keep it stable on: may 21 2019. Matches our champion PGA exactly AC amplifier with programmable gain amplifiers can be conveniently changed via small. Amplifier with programmable gain amplifiers can be combined to provide independent gain and bandwidth control two... Notice what 's happening to the amplifier 's gain can be conveniently via... Range signals your PGA parade, R 1, 10, 100 and 1000 next section, PGAs... Pick Ron and Ibias such that the programmable gain amplifier circuit is small enough not to rain your. Of its gains independent of one another quick review of subcircuits, check the... Does flow available from the equations - Ron such as 1, 10, 100 run. Implementing a programmable gain amplifier output by opening a new plot window adding! With the *.cir extension although our blue-ribbon PGA is insensitive to,... Embedded control system 's most desirable features is its negligible input current Pot are to!
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