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Chopper Circuits


Last Updated: December 31, 2017 06:47 AM

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AN9Application Considerations and Circuits for a New Chopper-Stabilized Op Amp Linear Technology AN9 __ Designed by Jim WilliamsAug 5th, 1986

Chop the Noise Gain to Measure an Op Amp's Real-Time Offset Voltage 04/03/08  EDN-Design Ideas A new method of chopping input noise allows you to measure an op amp's offset voltage in real time__ Circuit Design by Glen Brisebois, Linear Technology, San Jose, CA

Chopped Amplifier exacts only 5 µA 05/22/97 EDN-Design Ideas The chopped amplifier in Figure 1 combines low supply current of 5.5 µA with high accuracy.  The offset voltage is 5 µV with a drift of 0.05 µV/°C.  The gain exceeds 108, which affords high accuracy, even at large closed-loop gains.__ Circuit Design by Design by Jim Williams, Linear Technology Corp, Milpitas, CA

Chopper Amplifiers Complement a DC Accurate Low-Pass Filter DN9 Design Notes___ Linear Technology/Analog Devices

Chopper-stabilized Amplifier cascade yields 160 to 10,240 programmable gain 11/23/06 EDN-Design Ideas Amplify microvolt-level signals with a minimal-component-count circuit__ Circuit Design by Jerome E Johnston, Cirrus Logic Corp, Austin, TX

Chopping Reduces Reference’s Supply Current 04/10/97 EDN-Design Ideas UPDATED LINK! The 10V precision reference, IC3, in Figure 1 has temperature drift of approximately 0.6 ppm/�C and good long-term stability.  However, because of its zener-based design, this reference needs more than 4 mA of supply current.  To reduce this current, the circuit in Figure 1  supplies the reference with chopped power.  This scheme lowers the mean supply__ Circuit Design by Hartmut Henkel, von Hoerner & Sulger GmbH, Schwetzingen, Germany

Signal Chopping Enhances Bridge Performance 06/22/95 EDN-Design Ideas You can implement signal-chopping techniques, such as those found in CMOS chopper-stabilized amplifiers, at the system level to obtain the offset stability of chopper amplifiers.  Moreover, you'll obtain the better noise performance of bipolar amplifiers.  The bridge measurement system in Fig 1 uses the MIC4428 driver to "chop" the bridge excitation, with polarity reversal upon command from the system microcontroller (µC).  The DG303 multiplexer selects either the bridge output or a voltage proportional to the bridge excitation.__ Circuit Design by Jerome Johnston, Crystal Semiconductor, Austin, TX

Ultra Low Noise Op Amp Combines Chopper & Bipolar Op Amps DN36 Design Notes __ Linear Technology/Analog Devices

Chopper Circuits

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