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A 0.7V low power LNA combines a 1∶3 frontend balun with dual-path noise and non-linearity cancellation for improved noise performance at low power. In traditional techniques only the noise of the main path is cancelled while the noise of the auxiliary path is minimized by using high power. In the proposed design, the noise and non-linearity of both the main and the auxiliary paths are mutually cancelled...
This paper presents a prototype analog 4-channel-I/Q polyphase-FFT filter bank (PFFB) using passive switched capacitor circuits to channelize wideband signals. Like FFTs, the proposed PFFB shares computations for low power. The PFFB allows for a longer “effective window length” than is possible in a standard FFT. This characteristic of the PFFB maintains a narrow main-lobe bandwidth combined with...
The design of differential pair based OTAs is becoming increasingly difficult in finer geometries due to lower supply voltages. Inverter based designs have proven to have better transconductance efficiency, higher swing and better linearity but have degraded CMRR, worse PSRR and limited PVT tolerance. In this tutorial, we discuss traditional amplifiers and why inverter based amplifiers are better...
We present a fully integrated hybrid filter bank ADC based on an analog-FFT geared for baseband signal processing in wireless receivers. The design consists of an 8-point A-FFT for an analysis filter bank, a VGA bank and a sub-ADC bank in the analog domain, and an inverse VGA bank, calibration and inverse FFT for the synthesis filter in the digital domain. The proposed structure enables the signals...
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