A new differential CMOS current pre-amplifier for optical communications

Author

Sun, Bendong ; Yuan, Fet

Author_Institution

Dept. of Electr. & Comput. Eng., Ryerson Univ., Toronto, Ont., Canada

Volume

1

fYear

2003

fDate

25-28 May 2003

Abstract

This paper presents a new low-voltage fully differential CMOS current-mode pre-amplifier for optical communications. The number of transistors between the power and ground rails is minimum so that the minimum supply voltage is only V_T + V_sat. The pre-amplifier is a balanced two-stage configuration such that the effect of bias-dependent. mismatches is minimized. This configuration also achieves wide bandwidth and high current gain with reduced power consumption and transistor sizes. To lower the input impedance and increase the bandwidth, a new differential current-current negative feedback is introduced. In addition, a current-current common-mode feedback is employed to increase the common-mode rejection ratio (CMRR). The pre-amplifier is designed using a 0.18 μm 1.8 V CMOS technology. Simulation results from SPICE demonstrate that with a 0.5 pF photo diode capacitance, the pre-amplifier provides 31 dB current gain or equivalently 65 dB trans-impedance gain at 2.53 GHz.

Keywords

CMOS analogue integrated circuits; circuit feedback; circuit optimisation; circuit simulation; current-mode circuits; differential amplifiers; integrated circuit design; low-power electronics; optical communication equipment; preamplifiers; 0.18 micron; 0.5 pF; 1.8 V; 2.53 GHz; 31 dB; 65 dB; CMOS preamplifier; CMRR; balanced two-stage configuration; bias-dependent mismatch minimization; common-mode feedback; common-mode rejection ratio; current gain; current negative feedback; current-mode preamplifier; fully differential preamplifier; high current gain; input impedance; low-voltage preamplifier; optical communications; photo diode capacitance; power consumption reduction; supply voltage minimization; trans-impedance gain; transistor size reduction; wide bandwidth; Bandwidth; CMOS technology; Energy consumption; Gain; Impedance; Negative feedback; Optical fiber communication; Rails; SPICE; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on

Print_ISBN

0-7803-7761-3

Type

conf

DOI

10.1109/ISCAS.2003.1205570

Filename

1205570