A new approach to realize variable gain amplifiers

被引：8

作者：

Abdelfattah, KM ^{[1
]}

Soliman, AM ^{[1
]}

机构：

[1] Cairo Univ, Fac Engn, Dept Elect & Commun Engn, Giza 12211, Egypt

来源：

ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING | 2002年 / 30卷 / 03期

关键词：

variable gain amplifiers;

D O I：

10.1023/A:1014440703522

中图分类号：

TP3 [计算技术、计算机技术];

学科分类号：

0812 ;

摘要：

A new methodology to develop variable gain amplifiers is developed. The methodology is based on a feedback loop to generate the exponential characteristic, which is required for VGA circuits. The proposed idea is very suitable for applications that require very low power consumption, and as an application, a new current mode variable gain amplifier will be shown. The gain is adapted via a current signal ranges from -7.5 muA to +6.5 muA. Pspice simulations based on Mietec 0.5 mum CMOS technology show that the gain can be varied over a range of 29.5 dB, with bandwidth of 3 MHz at maximum gain value. The circuit operates between +/-1.5 V and consumes an average amount of power less than 495 muW.

引用

页码：257 / 263

页数：7

共 8 条

[1]

BRANNEN R, 1999, P IEEE INT S CIRC SY, P318

[2]

Elwan H, 1999, ICM'99: ELEVENTH INTERNATIONAL CONFERENCE ON MICROELECTRONICS - PROCEEDINGS, P51

[3]

Green MM, 2000, ISCAS 2000: IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS - PROCEEDINGS, VOL IV, P461, DOI 10.1109/ISCAS.2000.858788

[4] A LOW-POWER CMOS VGA FOR 50 MB/S DISK-DRIVE READ CHANNELS [J].

HARJANI, R .

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-ANALOG AND DIGITAL SIGNAL PROCESSING, 1995, 42 (06) :370-376

[5]

Huang PC, 1998, ISCAS '98 - PROCEEDINGS OF THE 1998 INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOLS 1-6, P285, DOI 10.1109/ISCAS.1998.704417

[6]

IBRAHIM M, 1999, P IEEE INT S CIRC SY, P628

[7]

ISMAIL M, 1993, ANALOG VLSI SIGNAL I, pCH6

[8] A low-voltage low-power wide-range CMOS variable gain amplifier [J].

Motamed, A ;

Hwang, C ;

Ismail, M .

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-ANALOG AND DIGITAL SIGNAL PROCESSING, 1998, 45 (07) :800-811

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