A low-power high-frequency all-pass-filter-based sinusoidal quadrature oscillator using CMOS current mirrors

2009 ◽  
Author(s):  
A. Leelasantitham ◽  
B. Srisuchinwong
Keyword(s):  
Low Power ◽  
High Frequency ◽  
Pass Filter ◽  
Quadrature Oscillator ◽  
Current Mirrors

scholarly journals New Realization of Quadrature Oscillator using OTRA

2017 ◽  
Vol 7 (4) ◽  
pp. 1815 ◽  
Author(s):  
Gurumurthy Komanaplli ◽  
Neeta Pandey ◽  
Rajeshwari Pandey
Keyword(s):  
High Frequency ◽  
Closed Loop ◽  
Harmonic Distortion ◽  
Cmos Process ◽  
Third Order ◽  
Pass Filter ◽  
Fully Integrated ◽  
Quadrature Oscillator ◽  
Electronically Tunable ◽  
High Pass

In this paper a new, operational transresistance amplifier (OTRA) based, third order quadrature oscillator (QO) is presented. The proposed structure forms a closed loop using a high pass filter and differentiator. All the resistors employed in the circuit can be implemented using matched transistors operating in linear region thereby making the proposed structure fully integrated and electronically tunable. The effect of non-idealities of OTRA has been analyzed which suggests that for high frequency applications self-compensation can be used. Workability of the proposed QO is verified through SPICE simulations using 0.18μm AGILENT CMOS process parameters. Total harmonic distortion (THD) for the proposed QO is found to be less than 2.5%.The sensitivity, phasenoise analysis is also discussed for the proposed structure.

A Low Power Low-Pass Fourth-Order Filter for WiMAX/LTE Receiver in CMOS 45nm Technology

2016 ◽  
Vol 26 (03) ◽  
pp. 1750048 ◽  
Author(s):  
Vida Orduee Niar ◽  
Gholamreza Zare Fatin
Keyword(s):  
Low Power ◽  
Fourth Order ◽  
Supply Voltage ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Power Filter ◽  
Order Filter ◽  
Source Follower ◽  
Low Pass ◽  
Circuit Technique

In this paper, a [Formula: see text]-[Formula: see text] low-pass and low power filter with tunable in-band attenuation for WiMAX/LTE receiver is presented. The fourth-order filter consists of two cascaded biquad stages. The source-follower (SF) stage is used as a key building block in these biquads. In this paper, we have presented a circuit technique to reduce the nonlinearity of the SF stage resulting from unmatched signal swings at the gate and source terminals of the input transistor. The proposed SF stage, is used for design of a linear biquad which is then utilized in a fourth-order Butterworth low-pass filter. The simulation results of the filter for bandwidth of 10 MHz show that the IIP3 of the filter is equal to 8.22[Formula: see text]dBm, in-band noise density is 100[Formula: see text]nV/[Formula: see text]Hz and power consumption is 5.9[Formula: see text]mW. The supply voltage of the filter is equal to 1[Formula: see text]V.

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