Feedforward compensation techniques for high-frequency CMOS amplifiers

Sansen, Willy; Chang, Zhihua

doi:10.1109/4.62197

Cited by 72 publications

(36 citation statements)

References 10 publications

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“…Also many other examples can be found where the use of pole/zero plots versus some design variables can be a useful guide for design. Just to mention one case, this type of representation has been recently used to study feedforward compensation for CMOS op amps [18]. MOSFETs, and GaAs MESFETs), op amps, and OTAs (see figure 7).…”

Section: Ii(s ) D(s)mentioning

confidence: 99%

Interactive AC modeling and characterization of analog circuits via symbolic analysis

Fernández

Rodríguez-Vázquez

Huertas

1991

Analog Integr Circ Sig Process

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Section: Ii(s ) D(s)mentioning

confidence: 99%

Interactive AC modeling and characterization of analog circuits via symbolic analysis

Fernández

Rodríguez-Vázquez

Huertas

1991

Analog Integr Circ Sig Process

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“…For example, this technique is widely used to reduce nonlinear distortion in amplifiers [39][40][41][42][43][44][45][46][47]. Moreover, it is successfully employed to frequency compensation of operational amplifiers (Opamps) and OTAs [48][49][50][51][52].…”

Section: Introductionmentioning

confidence: 99%

Programmable feedforward linearized CMOS OTA for fully differential continuous‐time filter design

Szczepański

Pankiewicz

Koziel

2009

Circuit Theory & Apps

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SUMMARYIn this paper, a feedforward linearization method for programmable CMOS operational transconductance amplifier (OTA) is described. The proposed circuit technique is developed using simple source-coupled differential pair transconductors, a feedback-loop amplifier for self-adjusting transcoductance (g m ) and a linear reference resistor (R). As a result, an efficient linearization of a transfer characteristic of the OTA is obtained. SPICE simulations show that for 0.35 m AMS CMOS process with a single +3 V power supply, total harmonic distortion at 1 V pp and temperature range from −30 to +90 • C is less than −49.3 dB in comparison with −35.8 dB without linearization. Moreover, the input voltage range of linear operation is increased. Power consumption of the linearized OTA circuit is 0.86 mW. Finally, the OTA is used to design a third-order elliptic low-pass filter in high-frequency range. The cut-off frequency of the operational transconductance amplifier-capacitor (OTA-C) filter is tunable in the range of 322.6 kHz-10 MHz using the feedforward linearized OTAs with the digitally programmable current mirrors.

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“…By proper selection of C c , w zc can negate the effect of w px and feed forward compensation could be done [6]. So C c is obtained as equation (7).…”

Section: Small Signal Analysismentioning

confidence: 99%

A wide-band multipath CMOS OTA for high speed applications

Vatanjou

Koozehkanani

Sobhi

et al. 2011

IEICE Electron. Express

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Abstract:A fast settling multipath CMOS OTA for high speed switched capacitor applications is presented here. With the basic topology similar to folded-cascode, bandwidth and DC gain of the OTA are enhanced by adding extra paths for signal from input to output. Designed circuit is simulated with HSPICE using level 49 parameters (BSIM 3v3) in 0.35 um standard CMOS technology. The DC gain achieved is 56.7 db and the Unity Gain Bandwidth (UGB) obtained is 1.15 GHz.

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Feedforward compensation techniques for high-frequency CMOS amplifiers

Cited by 72 publications

References 10 publications

Interactive AC modeling and characterization of analog circuits via symbolic analysis

Interactive AC modeling and characterization of analog circuits via symbolic analysis

Programmable feedforward linearized CMOS OTA for fully differential continuous‐time filter design

A wide-band multipath CMOS OTA for high speed applications

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