H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/06 (2006.01) H03F 3/08 (2006.01) H04B 10/14 (2006.01) H03K 17/785 (2006.01)
Patent
CA 2311434
A photoelectric receiver circuit provides a symmetrical sensor having a transimpedance amplifier on each side of the PIN diode, the outputs of the transimpedance amplifiers being AC coupled to a differential post amplifier. The differential structure provides a very high common noise voltage rejection ratio and a virtual ground to the inverting inputs of the transimpedance amplifiers. In the preferred embodiment a differential PIN diode bias voltage is established by separate bias voltages respectively applied to the non-inverting input of each transimpedance amplifier. Thus, a low-noise voltage regulator can be used to supply power to the bias voltages in the invention, and the AC coupling capacitors can be very small to conserve space on the chip die. Auxiliary DC currents applied to both sides of the PIN diode maintain the PIN diode bias as high as possible and maximize the output swing ranges of the transimpedance amplifiers in order to retain a wide bandwidth. The DC current sources allow the output bias voltages of the transimpedance amplifiers to be adjusted, and when controlled by the transimpedance amplifier outputs through a low pass filter, the output bias offset caused by ambient light can be eliminated. The feedback resistors may be variable resistors to provide automatic gain control.
Feng Kai D.
Hartley Lee F.
Ibm Canada Limited - Ibm Canada Limitee
Rosen Arnold
LandOfFree
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