Variable gain amplifiers based on a new approximation method to realize the exponential function
IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications - Tập 49 Số 9 - Trang 1348-1354 - 2002
Tóm tắt
A new current mode variable-gain amplifier (VGA) is developed. The new circuit is based on a novel approximation function that is very close to the ideal exponential relation over a very wide range. Pspice simulations are provided based on Mietec 0.5-/spl mu/m CMOS technology. The simulations show that the dynamic range achieved is over 50 dB in a single stage. The proposed circuit consumes average power less than 1.2 mW using /spl plusmn/1.5 V supply voltages.
Từ khóa
#Approximation methods #Dynamic range #CMOS technology #Circuit simulation #Difference equations #Voltage #Gain control #Auditory system #Communication system control #Bipolar transistorsTài liệu tham khảo
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