An improved Source Follower based low-pass Sallen-Key continuous time biquadratic cell is presented. An innovative structure with auxiliary path is proposed in order to increase the out-of-band attenuation of Sallen-Key filter. The auxiliary path eliminates one out-of-band parasitic zero in the transfer function. A prototype of Sallen-Key second order filter with a bandwidth of 120MHz and a quality factor of 1.19 has been designed in a standard 0.35μιη technology occupying 390μιη X 222μm area. A 75dB HD3 for a IV input signal and 50dB out-of-band attenuation at 3.2GHz are the filter peculiarity. The cutoff frequency deviation due to technological spread, aging and temperature variation is adjusted by using 4-bits capacitors arrays.
Resta, F., D'Amico, S., DE MATTEIS, M., Baschirotto, A. (2015). An improved source-follower based Sallen-Key continuous-time biquadratic cell with auxiliary path. In NORCHIP 2014 - 32nd NORCHIP Conference: The Nordic Microelectronics Event. Institute of Electrical and Electronics Engineers Inc. [10.1109/NORCHIP.2014.7004729].
An improved source-follower based Sallen-Key continuous-time biquadratic cell with auxiliary path
RESTA, FEDERICAPrimo
;DE MATTEIS, MARCELLOPenultimo
;BASCHIROTTO, ANDREAUltimo
2015
Abstract
An improved Source Follower based low-pass Sallen-Key continuous time biquadratic cell is presented. An innovative structure with auxiliary path is proposed in order to increase the out-of-band attenuation of Sallen-Key filter. The auxiliary path eliminates one out-of-band parasitic zero in the transfer function. A prototype of Sallen-Key second order filter with a bandwidth of 120MHz and a quality factor of 1.19 has been designed in a standard 0.35μιη technology occupying 390μιη X 222μm area. A 75dB HD3 for a IV input signal and 50dB out-of-band attenuation at 3.2GHz are the filter peculiarity. The cutoff frequency deviation due to technological spread, aging and temperature variation is adjusted by using 4-bits capacitors arrays.
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