Nth-Order Multifunction Filter Employing Current Differencing Transconductance Amplifiers

2015 ◽  
pp. 3-12
Author(s):  
Meili Cao ◽  
Haizhen He ◽  
Rongming Luo ◽  
Lei Wen
Keyword(s):  
Multifunction Filter ◽  
Transconductance Amplifiers

scholarly journals Programmable OTA-Based Multifunction Active Filter

1994 ◽  
Vol 17 (1) ◽  
pp. 21-27
Author(s):  
Abdulrahman Khalaf Al-Ali ◽  
Muhammad Taher Abuelma'atti ◽  
Rizwan Ali Tiwana
Keyword(s):  
Transfer Function ◽  
Transfer Functions ◽  
Active Filter ◽  
Vlsi Implementation ◽  
Operational Transconductance Amplifiers ◽  
Digital To Analog Converters ◽  
Centre Frequency ◽  
Single Structure ◽  
Multifunction Filter ◽  
Transconductance Amplifiers

A fully programmable multifunction filter is presented. The filter uses four operational transconductance amplifiers and two capacitors. Analog switches are used to control the filter transfer function through a microcontroller. The user is provided control over the cutoff (or centre) frequency of the filter by controlling the auxiliary bias currents of the operational transconductance amplifiers via digital-to-analog converters. The circuit can simultaneously provide three programmable transfer functions in a single structure and can realize all the standard second-order filters. The circuit is attractive for VLSI implementation.

scholarly journals Current-Mode Third-Order Quadrature Oscillator Using CDTAs

2009 ◽  
Vol 2009 ◽  
pp. 1-5 ◽  
Author(s):  
Jiun-Wei Horng
Keyword(s):  
Theoretical Analysis ◽  
Phase Difference ◽  
Oscillation Frequency ◽  
Current Mode ◽  
Third Order ◽  
Quadrature Oscillator ◽  
Oscillation Condition ◽  
Transconductance Amplifiers ◽  
Simulation Results ◽  
A Current

This paper describes a current-mode third-order quadrature oscillator based on current differencing transconductance amplifiers (CDTAs). Outputs of two current-mode sinusoids with90°phase difference are available in the quadrature oscillator circuit. The oscillation condition and oscillation frequency are orthogonal controllable. The proposed circuit employs only grounded capacitors and is ideal for integration. Simulation results are included to confirm the theoretical analysis.

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