A 900 MHz 1.2 V CMOS mixer with high linearity

Cheng, Wang-Chi; Chan, Cheong-Fat; Choy, Chiu-Sing; Pun, Kong-Pang

doi:10.1109/apccas.2002.1114896

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…6 shows a current-output Gilbert mixer. Compared to the voltage mode circuit, the current mode mixer has better linearity owing to its small internal node impedance, which reduces distortion [11]. Therefore, the diode load formed by M7 and M8 is used in the output stage of the Gilbert mixer, with the M9 and M10 current mirrors drawing out the IF current signal to avoid distortion.…”

Section: B Variable Gain Gilbert Mixermentioning

confidence: 99%

An Ultra-Small Area and High-Sensitivity Wireless Receiver for ISM and MICS Band Application

Chen,

Yang,

Qiao

2023

IEEE Access

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In this work, a 0.43mm 2 high-sensitivity low-intermediate-frequency (low-IF) receiver under 0.18 µm technology is reported for Industrial Scientific Medical (ISM) and Medical Implant Communications Service (MICS) band applications, which supports the 2ASK/GFSK demodulation mode. To reduce the area, a low noise amplifier (LNA) with an active inductor, a compact Gm-C filter, an AC current bleeding technique for controlling the receiver gain and, a ring-VCO LO PLL were used, without any passive inductors. The main methods for improving sensitivity are reducing the receiver noise figure (NF) and improving the signal-tonoise ratio for demodulation. Thus, the LNA adopts a two-stage 40 dB gain to suppress the NF of the subsequent stage. An automatic gain control (AGC) loop is used to control the receiver gain to overcome the large signal nonlinearity from the large LNA gains. Additionally, a Gm-C complex filter rejects image and blocks interference, improving the sensitivity to harsh environments. Under the CSMC 0.18 µm process, the die of the receiver is only 0.43 mm 2 and covers 300-500 MHz, MICS and some ISM bands. The measurement results show that when the internal 2ASK demodulator is adopted, it has a -115 dBm sensitivity at 2 Kbps; and when the external GFSK digital baseband is adopted, it has a -121 dBm sensitivity at 2 Kbps. At 300 Kbps, only 6.5 mW of power is consumed. It is suitable for low-power wide-area network (LPWAN) applications.INDEX TERMS Active inductor load LNA, AGC loop, Gm-C filter, ISM/MICS band, low-IF receiver, LPWAN, radio frequency, 2ASK/GFSK modulation.

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Section: B Variable Gain Gilbert Mixermentioning

confidence: 99%

An Ultra-Small Area and High-Sensitivity Wireless Receiver for ISM and MICS Band Application

Chen,

Yang,

Qiao

2023

IEEE Access

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A 900MHz low voltage low power highly linear mixer for direct-conversion receivers

Yang¹,

Kim²,

Lee³

10th IEEE International Conference on Electronics, Circuits and Systems, 2003. ICECS 2003. Proceedings of the 2003

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This paper presents a 900MHz low voltage, low power down-convenion mixer with high linearity for directconversion receivers. As a way to improve the third-order linearity, this paper proposes a very linear transconductance amplifier in which the size of the transistors is optimized to minimize the third-order intermodulation distortion (IMD3). A folded mixer topology is used in the designed mixer to enable the mixer to operate at low supply voltage. The design is based on a standard 0.25pm CMOS technology, and the simulation results show 15dBm of input IP3, SOdBm of input IP2, and 4 5 d B of power conversion gain while dissipating a total current of 3mA from 1.25V supply.

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A 2.4 GHz High Linearity Subthreshold Current Mode Folded CMOS Mixer

Yuan

Wang

2011

IETE J Res

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In this paper, a new CMOS active mixer using a parallel-folded topology which can operate at sub-1 V supply voltage is proposed. Such current mode mixer requires less voltage headroom with good linearization. In the proposed circuit, LC resonators were adapted to replace a commonly used current source, and current mirrors replace the common load resistances to export currents, the core of mixer works in a subthreshold region. This paper analyzes the performance of the high-linearity current mode mixer, comparing with other current mode mixer; this circuit demonstrates competitive performance with a lower supply voltage, higher linearity. A layout was designed and simulated in the standard chartered 0.18 μm RF CMOS process with Spectre in Cadence Design Systems. Simulation results show a satisfied mixer performance at 2.4 GHz. The simulated 11P3 of 13.48 dBm, with a power gain of -0.21 dB is obtained. A low dissipation power of 5.3 mW at 1 V supply voltage is also achieved.

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A 900 MHz 1.2 V CMOS mixer with high linearity

Cited by 3 publications

References 7 publications

An Ultra-Small Area and High-Sensitivity Wireless Receiver for ISM and MICS Band Application

An Ultra-Small Area and High-Sensitivity Wireless Receiver for ISM and MICS Band Application

A 900MHz low voltage low power highly linear mixer for direct-conversion receivers

A 2.4 GHz High Linearity Subthreshold Current Mode Folded CMOS Mixer

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