Active solid-state devices (e.g. – transistors – solid-state diode – Regenerative type switching device – With light activation
Patent
1996-10-09
1998-06-16
Saadat, Mahshid D.
Active solid-state devices (e.g., transistors, solid-state diode
Regenerative type switching device
With light activation
257227, 257443, 257444, 257446, 257461, 438 57, H01L 2974, H01L 31111, H01L 27148, H01L 29768
Patent
active
057675384
ABSTRACT:
An integrated circuit photodetector includes a transimpedance amplifier including a differential amplifier stage with PNP emitter-coupled transistors and a PNP input transistor which are biased only by base currents of the emitter-coupled transistors, to achieve low input bias current. Low noise operation is achieved by bypass capacitors coupled between the bases and emitters of the input transistors, respectively. A constant current source supplies a current which develops a small pedestal voltage across a resistor to bias the non-inverting input of the transimpedance amplifier so as to avoid nonlinear amplification of low level light signals. A positively biased N-type guard tub surrounds the photodetector, which is formed in a junction-isolated N region on a P substrate, to collect electrons generated in the substrate by deep-penetrating IR light to prevent them from causing amplification errors. In one embodiment, a feedback network includes a resistor connected between the output of a buffer driven by the transimpedance amplifier and an inverting input thereof, and a capacitor connected between the output and inverting input of the transimpedance amplifier to provide low noise, fast settling operation.
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Burt Rodney T.
Meinel Walter B.
Mullins Edward
Stitt, II R. Mark
Burr-Brown Corporation
Saadat Mahshid D.
Wilson Allan
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