應用於溫度感測器之超低功率前端電路

Abstract

在此論文中，提出一個應用於低功率與低電壓的溫度感測器前端電路。為了達到低功率與低電壓，操做在弱反轉區的放大器將會被介紹。在這前端電路中，由於溫度感測器的訊號相當小，截波放大器(chopper amplifier)將在論文中被使用。除此之外，非連續性的低通濾波器也會被介紹。為了降低製程偏移的影響，使用一些電路技巧，用以消除運算放大器的偏移電壓。由於電路中使用到時脈開關，雜訊應此將會產生。因此在論文中藉由多餘的開關(dummy switches)製造反相的雜訊以消除單一開關所產生之雜訊

In this thesis, a low-power low-voltage front-end circuit of the thermopile is implemented. The amplifier working in weak inversion is introduced in order to reduce the power consumption. Because the output signal of the thermopile is very small, a chopper amplifier is needed in the front-end circuits to improve the SNR. Also, a switch-capacitor lowpass filter will be implemented following the chopper amplifier. To reduce the effects of process variation of amplifiers, a offset-cancellation technique is introduced. Dummy switches are used to reduce the clock feedthrough noise in our design.