Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2008-01-21
2010-02-23
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S283000
Reexamination Certificate
active
07667539
ABSTRACT:
An improved low-voltage, low-power, wide range, and linear Gm Cell is disclosed. In one embodiment, a method of linearizing output current with an input voltage using a Gm Cell includes receiving an input differential voltage by an emitter degenerated input stage and outputting a current including a linear part and a nonlinear part at signal output terminals Iout_P and Iout_M, converting the non-linear part of the output current to a voltage difference via a compression stage, converting the voltage difference to a linear output current by a linear voltage to current converter stage, outputting the linear output current using a current mirror output stage to the signal output terminals Iout_P and Iout_M, and summing the output currents of the emitter degenerated input stage and the current mirror output stage at the signal output terminals Iout_P and Iout_M to obtain a linear output current with the input differential voltage.
REFERENCES:
patent: 6628167 (2003-09-01), Morton et al.
patent: 6630864 (2003-10-01), Yang
“A 3.2-GHz Second-Order Delta-Sigma Modulator Implemented in InP HBT Technology,” IEEE Journal of Solid-State Circuits, vol. 30, No. 10, Oct. 1995, pp. 119-1127 (J.F. Jensen, G. Raghavan, A.E. Cosand and R.H. Walden).
“Precision Differential Voltage-Current Convertor,” Electronic Letters, vol. 9, No. 6, Mar. 1973, pp. 147-148 (Raimondo Caprio).
Brady III Wade J.
Nguyen Hieu P
Pascal Robert
Patti John J.
Telecky , Jr. Frederick J.
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