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- Ravindran, A., et al.
(författare)
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A differential CMOS current-mode variable gain amplifier with digital dB-linear gain control
- 2004
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Ingår i: Analog Integrated Circuits and Signal Processing. - 0925-1030 .- 1573-1979. ; 38:03-feb, s. 161-174
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Tidskriftsartikel (refereegranskat)abstract
- A novel CMOS variable gain amplifier operating on current signals with a dB-linear gain control is presented. The gain control is achieved by multiplying a digitally synthesized exponentially varying control current signal by a differential input signal in the current domain. A current amplifier at the output sets the gain to the desired level. Current-mode operation allows for a reduced supply voltage by minimizing the voltage swing at the low impedance nodes of the circuit. Multiple circuit realizations for various blocks are presented allowing for designs meeting different constraints. Experimental realization of the variable gain amplifier shows the validity of the presented approach.
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- Yoo, S. J., et al.
(författare)
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A highly linear CMOS baseband chain for wideband wireless applications
- 2004
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Ingår i: ETRI Journal. - : Wiley. - 1225-6463 .- 2233-7326. ; 26:5, s. 486-492
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Tidskriftsartikel (refereegranskat)abstract
- The emergence of wide channel bandwidth wireless standards requires the use of a highly linear, wideband integrated CMOS baseband chain with moderate power consumption. In this paper, we present the design of highly linear, wideband active RC filters and a digitally programmable variable gain amplifier. To achieve a high unity gain bandwidth product with moderate power consumption, the feed-forward compensation technique is applied for the design of wideband active RC filters. Measured results from a 0.5 mum CMOS prototype baseband chain show a cutoff frequency of 10 MHz, a variable gain range of 33 dB, an in-band IIP3 of 13 dBV, and an input referred noise of 114 muVrms while dissipating 20 mW from a 3 V supply.
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