The reduction of the supply voltage forces to develop system and circuit solutions able to achieve the same performance previously obtained with higher supply voltage. In this paper, a second-order Low Pass continuous-time filter operating at a 3 V power supply is presented. The prototype filter is implemented using a highly linear pseudo-differential transconductor. The input common-mode signal is canceled at the transconductor level using a feed-forward path. The output common mode voltage is controlled at the filter level using lossy integrators. A prototype cell has been realized in 1.2 µmV BiCMOS technology. The pole frequency can be tuned in the range 12–55 MHz. A THD of —40 dB is achieved for signals up to 1 Vppat 10 MHz. The dynamic range is approximately 60 dB.
Rezzi, F., Baschirotto, A., Castello, R. (1995). A 3 V 12–55 MHz BiCMOS Pseudo-Differential Continuous-Time Filter. IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I. FUNDAMENTAL THEORY AND APPLICATIONS, 42(11), 896-903 [10.1109/81.477200].
A 3 V 12–55 MHz BiCMOS Pseudo-Differential Continuous-Time Filter
BASCHIROTTO, ANDREA;
1995
Abstract
The reduction of the supply voltage forces to develop system and circuit solutions able to achieve the same performance previously obtained with higher supply voltage. In this paper, a second-order Low Pass continuous-time filter operating at a 3 V power supply is presented. The prototype filter is implemented using a highly linear pseudo-differential transconductor. The input common-mode signal is canceled at the transconductor level using a feed-forward path. The output common mode voltage is controlled at the filter level using lossy integrators. A prototype cell has been realized in 1.2 µmV BiCMOS technology. The pole frequency can be tuned in the range 12–55 MHz. A THD of —40 dB is achieved for signals up to 1 Vppat 10 MHz. The dynamic range is approximately 60 dB.
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