TY - GEN
T1 - A switched-capacitor biquad using a simple quasi-unity gain amplifier
AU - Paulino, Nuno Filipe Silva Veríssimo
AU - Goes, João Carlos da Palma
N1 - Sem pdf conforme despacho.
PY - 2013/1/1
Y1 - 2013/1/1
N2 - This paper presents a SC biquad using a simple quasi-unity gain amplifier. In sub-nanometer CMOS technologies the intrinsic gain of the transistors is low, this increases the difficulty of designing high gain amplifiers. The proposed SC filter is based on the Sallen-Key biquad and it requires only a simple low gain amplifier. A differential filter circuit, including a suitable low gain amplifier based on a fully-differential voltage-combiner is presented. The correct functionality of this circuit is validated through electrical simulations of a cascaded sixth order filter. These simulations show that for a clock frequency of 100 MHz, the frequency response of the circuit is very similar to the one of the prototype filter, with only a relative error of 1.1% in the attenuation value at the cutoff frequency.
AB - This paper presents a SC biquad using a simple quasi-unity gain amplifier. In sub-nanometer CMOS technologies the intrinsic gain of the transistors is low, this increases the difficulty of designing high gain amplifiers. The proposed SC filter is based on the Sallen-Key biquad and it requires only a simple low gain amplifier. A differential filter circuit, including a suitable low gain amplifier based on a fully-differential voltage-combiner is presented. The correct functionality of this circuit is validated through electrical simulations of a cascaded sixth order filter. These simulations show that for a clock frequency of 100 MHz, the frequency response of the circuit is very similar to the one of the prototype filter, with only a relative error of 1.1% in the attenuation value at the cutoff frequency.
KW - band-pass Sallen-Key
KW - Analog circuits
KW - switched-capacitor circuits
KW - voltage-combiner amplifier
U2 - 10.1109/ISCAS.2013.6572223
DO - 10.1109/ISCAS.2013.6572223
M3 - Conference contribution
SN - 978-1-4673-5760-9
SP - 1841
EP - 1844
BT - Circuits and Systems (ISCAS)
Y2 - 1 January 2013
ER -