A 10.7-MHz fully balanced, high- Q, 107-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 223, the total low output noise of 1.2826 mV rms , the third-order intermodulation-free dynamic range ( IMFDR 3 ) of 87 dB, and the wide dynamic range of 107 dB at 1% IM 3 . The centre frequency is current tunable over 3 orders of magnitude. Comparisons to other 10.7-MHz approaches are also included.