Systems and methods for analog finite impulse response (FIR) filters are provided. In certain embodiments, a receiver includes a cascade of a mixer, an analog FIR filter, and an analog-to-digital converter (ADC). By including the analog FIR filter along the signal path between the mixer and the ADC, design constraints of the ADC are relaxed. For example, the ADC can operate with relaxed specifications with respect to resolution and/or dynamic range when the analog FIR filter is included. The analog FIR filter can include a controllable transconductance circuit that delivers an integration current to a capacitor over an integration period, with the analog FIR filter's coefficients used to change the transconductance setting of the controllable transconductance circuit to different values over the integration period.
|Patent number||US10903820 (B2)|
|Publication status||Published - 26 Jan 2021|