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The demanding noise figure (NF) and linearity by direct conversion and low intermediate frequency (IF) architectures make the design of active mixer extremely challenging. According to second order intermodulation and flicker noise mechanisms reviewed in this paper, we find some factors affect both the IIP2 and NF of the Gilbert cell simultaneously. AC coupling is adopted to filter out the low frequency...
This paper presents a 5.8 GHz low noise amplifier (LNA) for electronic toll collection system (ETCS). Traditional design strategy of source inductor feedback amplifier (L-CSLNA) ignores the influence of off chip matching, such as print circuit broad (PCB), bonding wire and passive chip parts which greatly affect the performance of LNA at high frequency. In this paper we adopt 3D electromagnetic simulation...
This paper introduces a CMOS operational amplifier with constant transconductance, suitable for operation in low voltage environments. A constant transconductance is ensured for the whole common mode input stage which is based on flipped differential pairs. The proposed operational amplifier is designed to operate with a 1-V supply and is implemented in 0.18-μm standard CMOS technology. The results...
A 5-GHz fully integrated for China ETC applications, low-phase-noise and wide-band LC voltage controlled oscillator is presented. Low-phase-noise has been achieved by using control line filtering technology and avoiding the tail current source. The circuit is implemented in the 0.18um TSMC CMOS process. The oscillator is tuned from 5.27 to 6.41 GHz with switched capacitors. This VCO consumes 5.6mA...
In this paper, a 5.8 GHz integrated CMOS amplitude shift keying (ASK) demodulator for the China electronic toll collection system (ETCS) is presented. The ASK demodulator modulates the 256 Kbps baseband signal with reference to the 5.8 GHz carrier frequency for low power dissipation. The design is implemented in a 0.18 μm CMOS process. The measurement results show that the proposed ASK demodulator...
A low-power divide-by-4/5 unit of a prescaler is proposed. The power consumption and operating frequency of the extended true-single-phase-clock (E-TSPC)-based frequency divider is investigated. The short-circuit power and the switching power in the E-TSPC-based divider are analyzed. Compared with the existing design, a 20% reduction of power consumption is achieved. A divide-by-16/17 dual-modulus...
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