Practical design of the voltage controllable quadrature oscillator for operation in MHz bands employing new behavioral model of variable-voltage-gain current conveyor of second generation

In this paper, a versatile quadrature oscillator using single Differential Difference Second Generation Dual-X Current Conveyor (DD-DXCCII) as an active element, two grounded capacitors and three grounded resistors is presented. The proposed oscillator provides two current outputs and three voltage outputs in quadrature relationship simultaneously so named as versatile quadrature oscillator. The proposed versatile quadrature oscillator exhibits the feature of orthogonal control over the frequency of oscillation and condition of oscillation. Effects of non-idealities along with sensitivity analysis are also analyzed. The proposed circuit has low active and passive sensitivities. Parasitic study is further explored. The simulation results with 0.18μm CMOS process parameters using PSPICE are also given. Possible realization of proposed oscillator using AD-844 and LM13600 along with some simulation results are also given for completeness sake.

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CMOS Realizable and Highly Cascadable Structures of First-Order All-Pass Filters

Walailak Journal of Science and Technology (WJST) ◽

10.48048/wjst.2021.21451 ◽

2021 ◽

Vol 18 (14) ◽

Author(s):

Jitender Jitender ◽

Jitendra MOHAN ◽

Bhartendu CHATURVEDI

Keyword(s):

Second Generation ◽

Cmos Technology ◽

Current Conveyor ◽

Passive Component ◽

Pass Filter ◽

Quadrature Oscillator ◽

First Order ◽

Voltage Mode ◽

Fully Differential ◽

Low Sensitivity

Two novel resistorless structures of a first-order voltage-mode all-pass filter are presented in the paper. Both the structures employ a fully differential second-generation current conveyor (FDCCII) as the primary active element, in addition to an active resistor. A grounded capacitor is the only passive component used in both the structures. In both the structures, CMOS realization of FDCCII is utilized; hence, these structures are CMOS compatible. Some of the other highly demanded features possessed by the presented all-pass structures are: a simple circuit topology, electronic tunability, high input impedance, constraint-free operation in terms of passive component matching, and low sensitivity figures. The theoretical performances under ideal and non-ideal scenarios are presented in detail. Furthermore, the proposed idea is extended to an Nth-order voltage-mode all-pass filter and a quadrature oscillator to explore some of the possible applications. PSPICE simulation results verify the theoretical claims of the presented all-pass filters. HIGHLIGHTS Two novel resistorless structures of first-order all-pass filters based on fully differential second-generation current conveyor are presented Performance of the proposed structures are thoroughly described in ideal and non-ideal scenarios Theoretically described details of the proposed structures are verified by carrying simulations on PSPICE using 180 nm CMOS technology An Nth-order all-pass filter and a quadrature oscillator are also presented as applications GRAPHICAL ABSTRACT

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MOS-C Based Electronically Tuneable Current/Voltage-Mode Third Order Quadrature Oscillator and Biquadratic Filter Realization

Elektronika ir Elektrotechnika ◽

10.5755/j02.eie.28921 ◽

2021 ◽

Vol 27 (3) ◽

pp. 38-49

Author(s):

Hasan Cicekli ◽

Ahmet Gokcen

Keyword(s):

Second Generation ◽

Current Conveyor ◽

Pass Band ◽

Cmos Process ◽

Third Order ◽

Quadrature Oscillator ◽

Voltage Mode ◽

Current Voltage ◽

Sinusoidal Oscillator ◽

Biquadratic Filter

This paper introduces a new electronically tuneable third order quadrature oscillator and biquadratic filter with MOS-C realization using all grounded passive components. Voltage-mode second order low-pass, high-pass, band-pass filters using second generation current conveyor and a current/voltage-mode third order quadrature sinusoidal oscillator using multi-output second generation current conveyor are synthesized from the proposed circuit topology. All synthesized circuits are compatible with integration and the center frequency can be electronically tuned by the gate voltage of the MOS transistors. The proposed circuits do not need any component matching condition. Oscillation condition and frequency of oscillation can be independently controlled. Workability of the proposed circuits is validated by PSPICE software using 0.18 micrometer MOSIS CMOS process parameters at ±0.9 V supply voltage. Tuneability of the oscillator is demonstrated for a tested frequency range both in voltage-mode and current-mode operations.

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