General results for resistive noise in active RC and MOSFET-C filters

Abstract

Resistive noise in active RC and MOSFET-C filters is examined. The effects of impedance and frequency scaling are shown. The relationship between sensitivity and noise is considered. A bound for the product of resistive power dissipation and noise power spectral density is derived. Topology-independent and transfer function-independent bounds for the dynamic range, in filters with power dissipation constraint, are developed.

A Simple Technique to Evaluate the Noise Spectral Density in Operational Amplifier Based Circuits Using the Adjoint Network Theory

“…5, the voltage at node is equal to the voltage across the resistor which in turn is equal to the voltage across . Therefore Therefore, the currents through the norators and are given by: (10) The voltages across the two norators are identical. It is given by (11) There are two possibilities, corresponding to , and , giving a total of four different gyrator topologies.…”

“…In [1], [4], [9], [11], the input referred noise sources of the opamp are approximately referred to convenient locations to determine the noise transfer functions. In [10] and [12], the focus is obtaining bounds for the dynamic range, given a power dissipation. However, for a general topology, there is no simple method to evaluate the noise contribution of the various operational amplifiers to the output noise spectral density.…”

A 67.5 dB SFDR Full-CMOS VDSL2 CPE Transmitter and Receiver with Multi-Band Low-Pass Filter

“…The noise level of the filter is optimized to guarantee the minimum SNR of the transmitted signal and the linearity of the filter is also maximized to suppress the non-linearity components when the signal level is high [7]. Thus, the operational amplifier in the filter is designed to have low input-referred noise for the SNR and high DC gain for better linearity.…”