Amplifiers – Signal feedback – Nonlinear impedance element in loop path
Patent
1994-11-22
1996-06-11
Mullins, James B.
Amplifiers
Signal feedback
Nonlinear impedance element in loop path
330282, 330308, H03F 134, H03G 330
Patent
active
055259294
ABSTRACT:
A transimpedance amplifier circuit for converting an input current to an output voltage includes a feedback resistor variable circuit which is connected in parallel to a feedback resistor and a load resistor variable circuit which is connected to a collector of an amplifying transistor. The feedback resistor variable circuit includes a first resistor and a first P-N junction diode connected in series. After the first P-N junction diode turns on in accordance with the increase in the input current, the transimpedance is decreased. As a result, a wide input dynamic range can be achieved. The load resistor variable circuit includes a reference voltage source and a series circuit of a second P-N junction diode and a second resistor. After the second P-N junction diode turns on in accordance with the increase in the input current, an effective load resistance value of the amplifying transistor is decreased, whereby the gain of the amplification transistor is decreased. The transimpedance amplifier circuit has an increased input dynamic range, a sufficient phase margin while low noise characteristics are maintained. Further, because the transimpedance amplifier circuit adopts a P-N junction diode, it is less susceptible to the influence of variations in characteristics of the elements.
REFERENCES:
patent: 4612514 (1986-09-01), Shigaki et al.
patent: 5030925 (1991-07-01), Taylor
patent: 5363064 (1994-11-01), Mikamura
Sudou et al., "Experiment of Miniaturized PIN-AMP Module with Wide Dynamic Range", 4th Separated vol. of Collected Lecture Theses, Spring Nat'l. Conv., Inst. of Electronics, Information and Communication Engineers of Japan, 1992, p. 177.
Mikamura et al., "Low Noise and Wide Dynamic Range GaAs Preamplifier IC for Optical Communication", Tech. Study Report CS92-10, Inst. of Electronics, Information and Communication Engineers of Japan, pp. 61-68 Oct. 1992.
Hatakeyama Ichiro
Nagahori Takeshi
Mullins James B.
NEC Corporation
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