This paper presents the design of a 4th-order closed-loop continuous-time filter. This filter exploits an improved analog stage that makes linearity performance constant over the entire pass-band frequencies. In other words the filter has same HP3 at low and at high frequency. Hence the linearity performance are independent on the input tones bandwidth, whereas most of analog filters suffers from poor linearity when loop-gain reduces, i.e. close to the closed-loop poles frequency. In order to validate the hereby proposed design idea a 4th-order 25MHz-3dB bandwidth pseudo-differential filter has been designed and simulated in CMOS 28nm technology. The prototype consumes 820μW from 1V supply voltage and has 15dBm and 13dBm HP3 at 5&6MHz and 20&21MHz input tones, respectively.
De Matteis, M., D'Amico, A., Ciciotti, F., Baschirotto, A. (2017). Closed-loop continuous-time analog filter with almost constant IIP3 over the pass-band. In Proceedings - IEEE International Symposium on Circuits and Systems. Institute of Electrical and Electronics Engineers Inc. [10.1109/ISCAS.2017.8050505].
Closed-loop continuous-time analog filter with almost constant IIP3 over the pass-band
De Matteis M.
;D'Amico A.;Ciciotti F.;Baschirotto A.
2017
Abstract
This paper presents the design of a 4th-order closed-loop continuous-time filter. This filter exploits an improved analog stage that makes linearity performance constant over the entire pass-band frequencies. In other words the filter has same HP3 at low and at high frequency. Hence the linearity performance are independent on the input tones bandwidth, whereas most of analog filters suffers from poor linearity when loop-gain reduces, i.e. close to the closed-loop poles frequency. In order to validate the hereby proposed design idea a 4th-order 25MHz-3dB bandwidth pseudo-differential filter has been designed and simulated in CMOS 28nm technology. The prototype consumes 820μW from 1V supply voltage and has 15dBm and 13dBm HP3 at 5&6MHz and 20&21MHz input tones, respectively.
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