EP0185199A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical receiver with negative feedback
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1985-11-13
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Granted: —
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Expires: 2005-11-13
Abstract
Abstract A bootstrap negative feedback type photoelectric converting circuit for converting an optical signal into an electrical signal. A light receiving element receives incident light and provides an electrical signal to a field effect transistor (FET) and an inverting amplifier. A bipolar transistor is directly connected to the FET in complementary fashion to increase the gain of the source-follower amplifier to substantially unity and to reduce its output impedance to a very small value in order to reduce the effects of parasitic capacitance of the light receiving element at high frequencies.
Inventors
- 👤 Hisashi C/O Yokohama Works Takada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 14:23
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/60; H04B10/66; H04B10/69; H04B10/693
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A bootstrap photoelectric converting circuit comprising: a light receiving element with a first end connected to a power supply through a resistor, a field effect transistor (FET) coupled in source follower arrangement, having a gate input terminal connected to a second end of said light receiving element, an inverting amplifier for inversely amplifying the output of said FET, a feedback resistor coupling an output of said inverting amplifier to the gate input of said field effect transistor, a capacitor for applying an a.c. output signal component of said FET to one end of said light receiving element, and a bipolar transistor connected complementary to said FET to cause said amplifier to have a substantially unity gain and a small output impedance to reduce the influence of capacitance parasitic on said light receiving element on the frequency characteristics of said photoelectric converting circuit.
Claim 2
Dependent Claim
142 words
A bootstrap photoelectric converting circuit comprising: a light receiving element with a first end connected to a power supply through a resistor, a field effect transistor (FET) coupled in source follower arrangement, having a gate input terminal connected to a second end of said light receiving element, an inverting amplifier for inversely amplifying the output of said FET, a feedback resistor coupling an output of said inverting amplifier to the gate input of said field effect transistor, a capacitor for applying an a.c. output signal component of said FET to one end of said light receiving element, and a bipolar transistor connected complementary to said FET to cause said amplifier to have a substantially unity gain and a small output impedance to reduce the influence of capacitance parasitic on said light receiving element on the frequency characteristics of said photoelectric converting circuit.
References Cited (Backward Citations)
No citation records indexed.
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