Transimpedance Amplifier Circuit
First Claim
1. A transimpedance amplifier circuit comprising:
- an amplifier that amplifies a received signal;
an automatic gain control circuit that controls an amplification gain of the amplifier by a first time constant in accordance with a level of the received signal; and
a first selection circuit that selects the first time constant from a plurality of predetermined values.
1 Assignment
0 Petitions
Accused Products
Abstract
A transimpedance amplifier circuit (1) includes an amplifier (22) that amplifies a received signal, an automatic gain control (AGC) circuit (2) that controls the amplification gain of the amplifier by a first time constant in accordance with the level of the received signal, and a first selection circuit (25) that selects the first time constant from a plurality of predetermined values. This can simultaneously implement a short time constant of an AGC function necessary to instantaneously respond to a burst signal and a long time constant of the AGC function necessary to obtain a satisfactory bit error rate (BER) characteristic in a continuous signal by an inexpensive and compact circuit arrangement.
-
Citations
14 Claims
-
1. A transimpedance amplifier circuit comprising:
-
an amplifier that amplifies a received signal; an automatic gain control circuit that controls an amplification gain of the amplifier by a first time constant in accordance with a level of the received signal; and a first selection circuit that selects the first time constant from a plurality of predetermined values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
Specification