Analysis of Oscillation Amplitude and Phase Error in Multiphase LC Oscillators

Seifi, Sina; Naimi, Hossein Miar

doi:10.5829/idosi.ije.2013.26.06c.04

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…The I/Q mismatches could cause in phase and amplitude errors which in turn deviate the signal constellation from its ideal values and increase the EVM [6]. Studies show that mismatches among the LC tank elements are the main source of phase and amplitude errors [27,28]. So to overcome this issue, we used the structure proposed in [29] which is shown in Figure 15.…”

Section: Quadrature Oscillator Designmentioning

confidence: 99%

Design of a High Range, High Efficiency Spread Spectrum Transmitter for Audio Communication Applications

Seifi

Naimi

Andargoli

2019

IJE

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A B S T R A C TThis work proposes a direct sequence spread spectrum transmitter with high transmission range and efficiency for audio signals. It is shown that by choosing high process gain for spread spectrum signal the data could reach a range of 55km in the 2.4GHz ISM band. By employing a light modulation scheme, we have a relaxed SNR requirement for having a low bit error rate (BER) which translates to relaxed error vector magnitude (EVM) condition. Therefore a switching power amplfier (PA) is used in this work which improves the transmitter's efficiency while by taking PAs nonidealities into account we extracted the new equations to find the conditions to improve the efficiency compared to conventional zero current and zero current switching conditions. The PA efficiency is equal to 79.5% while having 30dBm output power. The mixer alongside power amplifier used in this work provide a conversion gain of 9 dB while having 16 dBm output compression point. The employed tunable quadrature oscillator has the ability to cancel phase and amplitude errors without comprimising the oscillator phase noise. The transmitter reaches an efficiency of 73.4% and an EVM of -32.75 dB.

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Section: Quadrature Oscillator Designmentioning

confidence: 99%

Design of a High Range, High Efficiency Spread Spectrum Transmitter for Audio Communication Applications

Seifi

Naimi

Andargoli

2019

IJE

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“…Also, it is important to improve other parameters of VCO like power consumption and phase noise after frequency compensating over the temprature range. The phase noise and power consumption are two critical issues in designing VCO [2]- [5].…”

Section: Introductionmentioning

confidence: 99%

A Temperature Compensation Voltage Controlled Oscillator Using a Complementary to Absolute Temperature Voltage Reference

Katebi

Nasri

Toofan

et al. 2019

IJE

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T his paper presents a temperature compensation voltage controlled oscillator (VCO) based on Cross-Coupled pair and Colpitts structures which is suitable for military fields. Also, two inductors have been used for increasing the negative conductance. By using this method, start-up condition has been improved. Two varactors and a simple capacitor bank are applied for covering a wide tunning range. T he VCO has been designed and simulated in T SMC 0.18 µm CMOS technology.To compensate the frequency drift over a temperature range, MOS varactors are used and biased with a complementary to absolute temperature (CTAT) voltage reference. This CT AT voltage reference has been applied to two varactors and decreased the frequncy drift over temperature range. By using this technique, the proposed VCO can achieve a very stable frequency of 11.5 PPM/°C at 24.35 GHz over a temperature range of-40~120 °C. Simulation results also show the VCO covers the frequency range of 23.75~24.8 GHz. T he simulated phase noise of center frequency is-102.6 dBc/Hz at 1 MHz offset frequency. T he VCO consumes 10.4 mW DC power under 1.8 V supply voltage. The figure of merit of the VCO is-179.8 after compensating.

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