scholarly journals Electronically Tunable Quadrature Oscillator Using Grounded Components with Current and Voltage Outputs

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Hua-Pin Chen
Keyword(s):  
Integrated Circuit ◽  
Output Impedance ◽  
Passive Components ◽  
Quadrature Oscillator ◽  
Oscillation Condition ◽  
Transconductance Amplifier ◽  
High Output Impedance ◽  
Electronically Tunable ◽  
Current Differencing Transconductance Amplifier ◽  
High Output

The electronically tunable quadrature oscillator using a single multiple-output current controlled current differencing transconductance amplifier (MO-CCCDTA) and grounded passive components is presented. The proposed configuration uses a single MO-CCCDTA, two grounded capacitors and one grounded resistor. Two high-output impedance quadrature current signals and two quadrature voltage signals with 90° phase difference. The oscillation condition and oscillation frequency of the proposed quadrature oscillator are independently controllable. The use of only grounded passive components makes the proposed circuit ideal for integrated circuit implementation.

scholarly journals Multifunction Current Differencing Cascaded Transconductance Amplifier (MCDCTA) and Its Application to Current-Mode Multiphase Sinusoidal Oscillator

2015 ◽  
Vol 66 (5) ◽  
pp. 241-249 ◽  
Author(s):  
Chunhua Wang ◽  
Hairong Lin
Keyword(s):  
Active Element ◽  
Low Voltage ◽  
Current Mode ◽  
Output Impedance ◽  
Oscillation Condition ◽  
Transconductance Amplifier ◽  
Sinusoidal Oscillator ◽  
High Output Impedance ◽  
Processing Circuit ◽  
High Output

AbstractIn this study, a new versatile active element, namely multifunction current differencing cascaded transconductance amplifier (MCDCTA), is proposed. This device which adopts a simple configuration enjoys the performances of low-voltage, low-input and high-output impedance, wide bandwidth etc. It simplifies the design of the current-mode analog signal processing circuit greatly, especially the design of high-order filter and oscillator circuits. Moreover, an example as a new current-mode multiphase sinusoidal oscillator (MSO) using MCDCTA is described in this paper. The proposed oscillator, which employs only one MCDCTA and minimum grounded passive elements, is easy to be realized. It can provide random n (n being odd or even) output current signals and these output currents are equally spaced in phase all at high output impedance terminals. Its oscillation condition and the oscillation frequency can be adjusted independently, linearly and electronically by controlling the bias currents of MCDCTA. The operation of the proposed oscillator has been testified through PSPICE simulation and experimental results.

GROUNDED CAPACITOR CM-APS WITH HIGH OUTPUT IMPEDANCE

2007 ◽  
Vol 16 (04) ◽  
pp. 567-576 ◽  
Author(s):  
SUDHANSHU MAHESHWARI
Keyword(s):  
Current Mode ◽  
Bias Current ◽  
Output Impedance ◽  
Quadrature Oscillator ◽  
Pspice Simulations ◽  
First Order ◽  
External Bias ◽  
High Output Impedance ◽  
High Output

This paper presents a new first order current mode all-pass section (CM-APS) with a grounded capacitor and employing a modified current controlled conveyor. The new circuit with high output impedance is ideal for current-mode cascading and is tunable through an external bias current. The proposed circuit is unique due to its features, not exhibited by any of the available works on the topic. An application of the circuit in realizing a quadrature oscillator is also given. The theory is validated through PSPICE simulations using real device transistors.

scholarly journals Analog Integrated Current Drivers for Bioimpedance Applications: A Review

Sensors ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 756 ◽  
Author(s):  
Nazanin Neshatvar ◽  
Peter Langlois ◽  
Richard Bayford ◽  
Andreas Demosthenous
Keyword(s):  
Integrated Circuit ◽  
Closed Loop ◽  
Harmonic Distortion ◽  
Open Loop ◽  
Phase Delay ◽  
Output Impedance ◽  
Wide Range ◽  
High Output Impedance ◽  
High Output

An important component in bioimpedance measurements is the current driver, which can operate over a wide range of impedance and frequency. This paper provides a review of integrated circuit analog current drivers which have been developed in the last 10 years. Important features for current drivers are high output impedance, low phase delay, and low harmonic distortion. In this paper, the analog current drivers are grouped into two categories based on open loop or closed loop designs. The characteristics of each design are identified.

ALL GROUNDED PASSIVE ELEMENTS CURRENT-MODE ALL-PASS FILTER

2009 ◽  
Vol 18 (01) ◽  
pp. 31-43 ◽  
Author(s):  
SHAHRAM MINAEI ◽  
ERKAN YUCE
Keyword(s):  
Current Mode ◽  
Current Conveyors ◽  
Output Impedance ◽  
Spice Simulation ◽  
Passive Components ◽  
Pass Filter ◽  
Variable Voltage ◽  
Minimum Number ◽  
High Output Impedance ◽  
High Output

In this paper, a new current-mode (CM) all-pass filter employing two Dual-Output Second-Generation Current Conveyors (DO–CCIIs), one grounded resistor and one grounded capacitor is presented. The proposed circuit exhibits low input impedance and high output impedance, which makes it suitable for cascading. Moreover, adding two extra resistors to the proposed circuit, a new gain-variable voltage-mode (VM) all-pass filter is obtained. A quadrature oscillator employing minimum number of grounded passive components is derived from the developed CM filter as an application of the first-order all-pass filter. Both of the proposed all-pass filters do not require matching of passive components. The effects of the parasitic impedances of the DO–CCIIs on the transfer function (TF) of the proposed CM filter as an example are investigated. In addition, the proposed CM all-pass filter and oscillator circuit are simulated using SPICE simulation program to confirm the theory.

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