A 10.7-MHz fully balanced, Q-of-267, 103-dB-dynamic-range current-tunable bandpass filter

Abstract

A 10.7-MHz fully balanced, high-Q, wide-dynamic-range current-tunable bandpass filter is presented. The technique is relatively simple based on three fully balanced components, i.e. an adder, a low-Q-based bandpass filter and a differential amplifier. The high-Q factor is possible through a tunable bias current. As a simple example at 10.7 MHz, the paper demonstrates the high-Q factor of 267, the total low output noise of 2.089 muVrms, the 3rd-order intermodulation-free dynamic range (IMFDR3) of 82.59 dB, and the wide dynamic range of 103 dB at 1% IM3. The centre frequency is current tunable over 3 orders of magnitude. Comparisons to other 10.7-MHz approaches are also included.