Electronically tunable voltage-mode quadrature oscillator based on high performance CCCDBA

Electronically tunable allpass filter: linear VCO design

“…2; error e was seen to be small for the ETAF while the THD-level (upto 7 th harmonic) for both ETAF and QVCO is quite low compared to [10,29,30,32]. Tuning error in Table II is measured upto 3.3 MHz by a new method here by evaluating the phase margin of the loop at gain-crossover frequency.…”

“…A relevant comparative summary to this extent is presented in Table I. It may be seen that albeit electronically tuned QVCOs are also proposed earlier [10,26,27,28,29,30,31,32], but such an oscillator based on electronically tunable AP filters with linear tuning law had not yet been presented, as is seen by the comparative description in Table I below.…”

Compact electronically tunable quadrature oscillator using single voltage differencing gain amplifier (VDGA) and all grounded passive elements

“…Moreover, its oscillation condition and oscillation frequency cannot be adjusted independently. A comparison study for the performance specifications of the previously available voltage-mode quadrature oscillators in [1][2][3][4][5][6][7][8][9][10][11][12][13][14] is summarized in Table 1.…”

Quadrature Oscillator Design with Gm-C Structure

“…In the literature, there are many quadrature oscillators, which were designed with such active elements, as operational transresistance amplifiers [1], current feedback amplifiers [2], current differencing buffered amplifier [3,4], second generation current conveyor [5], current controlled current differencing buffered amplifier [6], current differencing transconductance amplifier [7], fully differential second generation current conveyor [8], fully balanced voltage differencing buffer amplifier [9]. Furthermore, surface acoustic wave oscillators [10] can be found.…”

“…Circuit realizations of the quadrature oscillators, given in [1], require some floating capacitors, which are not suitable for integrated circuit implementation. In [2][3][4][5][6][7], the operation requires at least two active elements and three passive components. In [8,9], quadrature oscillators consist of a single active element and at least three passive components.…”