Wideband Variable-Gain Amplifiers Based on a Pseudo-Current-Steering Gain-Tuning Technique

This paper presents a Variable Gain Amplifier (VGA) designed in a 0.18 μm CMOS process to operate in an impedance sensing interface. Based on a transconductance-transimpedance (TC-TI) approach with intermediate analog-controlled current steering, it exhibits a gain ranging from 5 dB to 38 dB with a constant bandwidth around 318 kHz, a power consumption of 15.5 μW at a 1.8 V supply and an active area of 0.021 mm2.

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Binary Memory Implemented by Using Variable Gain Amplifiers With Multipliers

IEEE Access ◽

10.1109/access.2020.3034665 ◽

2020 ◽

Vol 8 ◽

pp. 197276-197286

Author(s):

Jiri Petrzela ◽

Roman Sotner

Keyword(s):

Variable Gain Amplifiers ◽

Variable Gain

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THE DIFFERENTIAL DIFFERENCE OPERATIONAL FLOATING AMPLIFIER: NEW CMOS REALIZATIONS AND APPLICATIONS

Journal of Circuits System and Computers ◽

10.1142/s0218126609005666 ◽

2009 ◽

Vol 18 (07) ◽

pp. 1287-1308 ◽

Cited By ~ 4

Author(s):

EMAN A. SOLIMAN ◽

SOLIMAN A. MAHMOUD

Keyword(s):

Analog Circuits ◽

Cmos Technology ◽

Pass Filter ◽

Low Pass Filter ◽

Variable Gain Amplifiers ◽

Variable Gain ◽

Fully Differential ◽

Filter Performance ◽

Low Pass ◽

Band Pass

This paper presents different novel CMOS realizations for the differential difference operational floating amplifier (DDOFA). The DDOFA was first introduced in Ref. 1 and was used to realize different analog circuits like integrators, filters and variable gain amplifiers. New CMOS realizations for the DDOFA are introduced in this literature. Furthermore the DDOFA is modified to realize a fully differential current conveyor (FDCC). Novel CMOS realizations of the FDCC are presented. The FDCC is used to realize second-order band pass–low-pass filter. Performance comparisons between the different realizations of the DDOFA and FDCC are given in this literature. PSPICE simulations of the overall proposed circuits are given using 0.25 μm CMOS Technology from TMSC MOSIS model and dual supply voltages of ±1.5 V.

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A digitally generated exponential function for dB-linear CMOS variable gain amplifiers

2002 14th International Conference on Digital Signal Processing Proceedings. DSP 2002 (Cat. No.02TH8628) ◽

10.1109/icdsp.2002.1027901 ◽

2003 ◽

Cited By ~ 1

Author(s):

A. Ravindran ◽

E. Vidal ◽

M. Ismail

Keyword(s):

Exponential Function ◽

Variable Gain Amplifiers ◽

Variable Gain

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Design of a 2 GHz Linear-in-dB Variable-Gain Amplifier with 80-dB Gain Range

Active and Passive Electronic Components ◽

10.1155/2014/434189 ◽

2014 ◽

Vol 2014 ◽

pp. 1-7

Author(s):

Zhengyu Sun ◽

Yuepeng Yan

Keyword(s):

Current Gain ◽

Variable Gain Amplifier ◽

Current Steering ◽

Gain Bandwidth ◽

Broad Bandwidth ◽

Variable Gain ◽

Bicmos Technology ◽

Sige Bicmos ◽

Bicmos Process ◽

Steering Current

A broadband linear-in-dB variable-gain amplifier (VGA) circuit is implemented in 0.18 μm SiGe BiCMOS process. The VGA comprises two cascaded variable-gain core, in which a hybrid current-steering current gain cell is inserted in the Cherry-Hooper amplifier to maintain a broad bandwidth while covering a wide gain range. Postlayout simulation results confirm that the proposed circuit achieves a 2 GHz 3-dB bandwidth with wide linear-in-dB gain tuning range from −19 dB up to 61 dB. The amplifier offers a competitive gain bandwidth product of 2805 GHz at the maximum gain for a 110-GHz ftBiCMOS technology. The amplifier core consumes 31 mW from a 3.3 V supply and occupies active area of 280 μm by 140 μm.

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