A CMOS variable gain amplifier for a wideband wireless receiver

A CMOS intermediate-frequency (IF) variablegain amplifier (VGA) is presented in this paper. A transconductance linearization scheme is proposed for the VGA core based on a signal-subtracting structure to achieve low distortion. Temperature-independent decibel-linear gain control characteristic is achieved by an exponential voltage generator based on transfer characteristics of differential pair. The whole VGA, including a highly-linear output stage, is fabricated in 0.25 µm CMOS technology. Measurements show that the VGA provides a total gain control range of 43 dB with less than 1.2 dB error over 0-80 • C, and a constant 3-dB bandwidth of 100 MHz. The third-order intermodulation (IM3) distortion at differential output of 2 V PP is better than − 55 dB. The VGA dissipates 22.6 mA averagely from 3.3 V supply, and occupies approximately 0.53 mm 2 .

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“…1(b) can provide lowdistortion operation [10,11]. The equivalent transconductance can be expressed as,…”

Section: Vga Architecturesmentioning

confidence: 99%

A low-distortion CMOS IF VGA with linear-in-dB control and temperature compensation

Yun

Yin

Huang

et al. 2007

Analog Integr Circ Sig Process

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“…However, the voltage gain tuning range, maximal voltage gain, and gain linearity in decibel trade off each other. In this VGA, the resistance R is chosen as 250 ohm to lead the AGC amplifier to have a uniform transient response [3,4]. In the input and output stages, M-derived half networks and fixed value feedback resistors are employed to exhibit uniform impedance for input and output impedance matching [5].…”

Section: B Variable Gain Amplifiermentioning

confidence: 99%

10GBase-LX CMOS Automatic Gain Control Amplifier Design

Wang¹,

Weisheng²,

Liu³

2005

2005 IEEE Asian Solid-State Circuits Conference

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a 5Gbps automatic gain control amplifier is presented with 27.8dB input dynamic range for 10GBase-LX4 Ethernet in 0.18um CMOS technology. Five push-pull inverters use self-bias resistors and inductive-series peaking technique to realize a variable gain amplifier (VGA). This VGA achieves 4GHz bandwidth and 20dB linear-in-dB gain tuning range. The proposed 5Gbps AGC amplifier yields constant output amplitude 100mV for an input 27.8dB dynamic range.

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“…VGA is an essential block in wireless receiver, which is used to accomodate the gain variation in the R F front-end and maximize the input signal to full scale of following AD converter [7]. In direct conversion receiver, the small gain of R F front-end puts a wide gain range requirement on baseband VGAs, which is above 60dB in our system.…”

Section: Variable Gain Amplifiermentioning

confidence: 99%

Design of a low-power CMOS baseband circuit for wideband CDMA testbed

Shi

Wu²,

Ismail³

2000

ISLPED'00: Proceedings of the 2000 International Symposium on Low Power Electronics and Design (Cat. No.00TH8514)

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In this paper, the design and performance of a CMOS baseband circuit for WCDMA direct conversion receiver are presented. Consisting of one 5th-order anti-aliasing filter, one 4th-order tunable channel filter, and three variable gain amplifier (VGA) stages, the baseband chain provides 72dB gain range with 2dB gain step and is tunable to select three different bandwidths (from 5MHz to 20MHz radio-frequency spacing). It dissipates only 18mW from a single 3V supply. The input IP3 is lOdBm, and the input-referred noise in the passband is 4 l n V / a .

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A CMOS variable gain amplifier for a wideband wireless receiver

Cited by 42 publications

References 5 publications

A low-distortion CMOS IF VGA with linear-in-dB control and temperature compensation

A low-distortion CMOS IF VGA with linear-in-dB control and temperature compensation

10GBase-LX CMOS Automatic Gain Control Amplifier Design

Design of a low-power CMOS baseband circuit for wideband CDMA testbed

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