A Transconductor and Tunable G(m) - C High-Pass Filter Linearization Technique Using Feedforward Gm3 Canceling

作者：Kim Duksoo^*; Kim Byungjoon; Nam Sangwook

来源：IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, 2015, 62(11): 1058-1062.

DOI：10.1109/TCSII.2015.2456611

• G(m) - C filter
• linearization
• transconductor
• tunable high-pass filter

A linearization technique of a transconductor circuit is proposed in this brief. By adopting a two-path feedforward architecture, the G(m3) component of the transconductor vanishes and a highly linear V -to-I conversion is achieved. This technique consists of self-biased inverters only, and it can be applied to transconductors with differential inputs. It also has an advantage in process scaling and precise bias control is not necessary. A tunableG(m) - C high-pass filter for the baseband of a frequency-modulated continuous-wave radar system is implemented using these linearized transconductors. The filter is synthesized with a high-order admittance method. The designed filter is fabricated in a 0.13-mu m CMOS process. The filter cutoff frequency can be tuned from 0.15 to 0.75 MHz with a current consumption value of 11-36 mA. An in-band input-referred third-order intercept point of + 19.4 dBm and a 1-dB compression point of + 5.35 dBm are measured, demonstrating a highly linear filter operation.

• 出版日期2015-11