Publication: Low noise op amp using chopper stabilization technique
Date
2012-06-01
Authors
Lau, Jun Giap
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Abstract
In this project, an approach of chopper stabilization technique on a folded cascode amplifier to reduce the low frequency noise is introduced. Chopper stabilization is the technique which modulates noise in low frequency to high frequency, and then diminishes the unwanted effect by a low pass filter. By employing high gain circuit design technique, this amplifier achieves approximately 60 dB voltage gain and also high unity gain bandwidth which is 277.3 MHz. A high voltage gain of op amp will provides high signal to noise ratio and a high bandwidth allows the switches to chop at high frequencies to reduce the noise while allow the thermal noise unchanged. The design is implemented by using VIRTUOSO CADENCE with SILTERRA 180 nm technology at 1.8 V supply voltage. The total chip area is . Albeit this project is focus on the basic chopper stabilized architecture, the circuit is also useful for a variety of sensor chips and biological monitoring instruments.