Active balun circuit for single-ended to differential RF...

Details Active balun circuit for single-ended to differential RF... Active balun circuit for single-ended to differential RF...

2005-07-26

2005-07-26

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including balanced to unbalanced circuits and vice versa

C330S258000, C330S306000

Reexamination Certificate

active

06922108

ABSTRACT:
An active balun circuit is provided for single-ended to differential RF signal conversion with enhanced common-mode rejection which suppresses common mode signal and which achieves phase and amplitude balance without sophisticated tuning or compensation methods. The circuit has a single-ended input and balanced output with phase and amplitude balance error less than 2° and 1.2 dB, respectively, measured from 1.5 GHz to 1.8 GHz at 5V supply. When supply voltage drops down to 1.5V, its phase and amplitude balance error remains within 5° and 2 dB, respectively. The circuit achieves a balanced output via an output network which behaves as an impedance matching network for differential mode signal and is grounded for common mode signal. As a result, common mode signal is suppressed and 180-degree phase balance at output is achieved. The circuit has high-linearity (P1 dBin=5 dBm, IIP3=16.6 dBm) and low residual phase noise (<−155 dBc/Hz at 100 kHz and above) which make it suitable as an active balun/buffer amplifier between LO and balanced mixer for base station receiver applications.

REFERENCES:
patent: 6057714 (2000-05-01), Andrys et al.
patent: 6252460 (2001-06-01), Ito
patent: 6441688 (2002-08-01), Lau et al.
Novel Active Differential Phase Splitters in RFIC for Wireless Applications, by Huainan Ma, Sher Jiun Fang, Fujiang Lin and Hiroshi Nakamura, IEEE Transactions On Microwave Theory And Techniques, vol. 46, No. 12, Dec. 1998.
A Novel HBT Active Transformer Balanced Schottky Diode Mixer, by Kevin W. Kobayashi, 1996 IEEE MTT-S Digest, pp. 947-950.
Digital cellular telecommunications system(Phase 2+);Radio transmission and reception(GSM 05.05 version 5.5.1), by European Telecommunications Standards Institute (ETSI) , Third Edition, Jan. 1998, pp. 1-50.

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