A linearization technique of a transconductor circuit is proposed in this brief. By adopting a two-path feedforward architecture, the component of the transconductor vanishes and a highly linear -to- 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 tunable 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- 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.
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