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Open AccessArticle

A Compact Size Wideband RF-VGA Based on Second Generation Controlled Current Conveyors

1
Departamento de Ingeniería Electrónica y Automática, Institute for Applied Microelectronics (IUMA), Universidad de Las Palmas de Gran Canaria, E-35017 Las Palmas de Gran Canaria, Spain
2
Departamento de Ingeniería Electrónica, Escuela Superior de Ingenieros, Universidad de Sevilla, E-41092 Las Palmas de Gran Canaria, Spain
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Electronics 2020, 9(10), 1600; https://doi.org/10.3390/electronics9101600
Received: 9 September 2020 / Revised: 28 September 2020 / Accepted: 29 September 2020 / Published: 30 September 2020
(This article belongs to the Special Issue CMOS Power Amplifier Design and Applications)
This paper presents a methodology to design a wideband radio frequency variable gain amplifier (RF-VGA) in a low-cost SiGe BiCMOS 0.35 μm process. The circuit uses two Class A amplifiers based on second-generation controlled current conveyors (CCCII). The main feature of this circuit is the wideband input match along with a reduced NF (5.5–9.6 dB) and, to the authors’ knowledge, the lowest die footprint reported (62 × 44 μm2 area). The implementation of the RF-VGA based on CCCII allows a wideband input match without the need of passive elements. Due to the nature of the circuit, when the gain is increased, the power consumption is reduced. The architecture is suitable for designing wideband, low-power, and low-noise amplifiers. The proposed design achieves a tunable gain of 6.7–18 dB and a power consumption of 1.7 mA with a ±1.5 V DC supply. At maximum gain, the proposed RF-VGA covers from DC up to 1 GHz and can find application in software design radios (SDRs), the low frequency medical implant communication system (MICS) or industrial, scientific, and medical (ISM) bands. View Full-Text
Keywords: radio frequency variable gain amplifier (RF-VGA); wideband amplifier; broadband amplifier; second-generation controlled current conveyor (CCCII); BiCMOS; ISM; MICS; SDR radio frequency variable gain amplifier (RF-VGA); wideband amplifier; broadband amplifier; second-generation controlled current conveyor (CCCII); BiCMOS; ISM; MICS; SDR
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del Pino, J.; L. Khemchandani, S.; Galante-Sempere, D.; Luján-Martínez, C. A Compact Size Wideband RF-VGA Based on Second Generation Controlled Current Conveyors. Electronics 2020, 9, 1600.

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