Electronically tunable multiphase sinusoidal oscillator using translinear current conveyors

Abstract

A new electronically tunable current-mode multiphase sinusoidal oscillator based on translinear current conveyors is presented. The proposed oscillator circuit, which employs only one translinear current conveyor and one grounded capacitor for each phase, can generate arbitrary N output current equal-amplitude signals that are equally spaced in phase (N being even or odd), all at high output impedance terminals. The frequency of oscillation and the condition of oscillation can be controlled electronically and independently through the bias current of the translinear current conveyor. The proposed structure also has simple circuitry, low-component count, and is highly suitable for integrated circuit implementation. The theoretical results were verified by PSPICE simulation. In addition, the modification of the N sinusoidal oscillators to construct a programmable multiphase oscillator is also discussed.

New Double Current Controlled CFA (DCC–CFA) Based Voltage–Mode Oscillator with Independent Electronic Control of Oscillation Condition and Frequency

“…Implementation of current gain control is more complicated [42]. Previously, in the four terminal floating nullor (FTFN) [60][61][62] has been implemented such solution, which internal structure contains CCII with special type of controlled current mirror sections, two auxiliary DC currents (gain is given by ratio of these currents), and also standard bias current. Therefore, theoretically it is possible to change current gain and intrinsic resistance R X in one modified CCII without their mutual affection.…”

“…The core of the CC 2 , shown in Fig. 3(b), is based on modified CCII with additional mirrors for current gain control, which was introduced in [60][61][62][63]. In Fig.…”

An Additional Approach to Model Current Followers and Amplifiers with Electronically Controllable Parameters from Commercially Available ICs

“…It seems to be a very interesting topic for researchers. Some novel types of current conveyors (Mahmound et al [9], Kumngern et al [10]), so-called current followers and nullors (Sedighi et al [11], Tangsrirat [12], Tangsrirat et al [13]), have been published quite recently. Alzaher et al [14,15] and Koton et al [16] utilized digital control of current gain in their active elements and applications.…”

All Pass Network Based MSO Using OTRA

“…For phase shifting either first-order low pass networks (LPNs) [5-7, 9-21, 24, 25] or first-order all pass networks (APNs) [2,8,22,23] are used. These reported structures provide either voltage [5][6][7][8][9][10][11][12][13][14][15][16] or current [2,[17][18][19][20][21][22][23][24] outputs.…”

“…Three topologies of OTRA based MSOs are proposed in [16] and are designed using LPNs. The structures proposed in [2,[17][18][19][20][21][22][23][24][25] provide current outputs which need to be converted back to voltage for circuits requiring voltage inputs, which would considerably increase the component count. A detailed comparison of these structures is given in Table 1 which suggests that OTRA based MSO is the most suitable choice for voltage output.…”