Optical receiver circuit
First Claim
1. An optical receiver circuit comprising:
- an amplifying part that amplifies an output signal from a photodiode;
a capacitor which is connected to the photodiode via a switch;
start-up controlling means for disconnecting a connection between the capacitor and the photodiode with the switch to start up the amplifying part in accordance with a stored charge amount in the capacitor;
judging means for judging whether a transmission signal is included in an output from the amplifying part; and
resetting means for resetting the capacitor in the case in which the judging means shows that a transmission signal is not included.
1 Assignment
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Accused Products
Abstract
In the case in which an input voltage to a comparator COMP reaches (½)×Vcc from initial Vcc in accordance with lowering of the electric potential at a nodal point N1, an output level of the comparator COMP is inverted to make the output level LOW. In the case in which the output level of the comparator COMP is made LOW, a switch for amplifying part SW3 is connected, and an optical receiver circuit 1 makes the shift to a half start-up state. A signal detector circuit SD as well is started up by the connection of the switch for amplifying part SW3. In the case in which an amplifying part 2 is started up, the signal detector circuit SD judges whether a transmission signal is included in an output from the amplifying part 2. In the case in which the signal detector circuit SD shows that a transmission signal is not included, the resetting switch SW2 is connected to reset a capacitor C1.
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Citations
5 Claims
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1. An optical receiver circuit comprising:
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an amplifying part that amplifies an output signal from a photodiode; a capacitor which is connected to the photodiode via a switch; start-up controlling means for disconnecting a connection between the capacitor and the photodiode with the switch to start up the amplifying part in accordance with a stored charge amount in the capacitor; judging means for judging whether a transmission signal is included in an output from the amplifying part; and resetting means for resetting the capacitor in the case in which the judging means shows that a transmission signal is not included. - View Dependent Claims (2, 3, 4, 5)
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Specification