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- Title
A Linear VCO Using Single CFA and Analog Multipliers: Quadrature Oscillator Implementation.
- Authors
Mathur, K.; Venkateswaran, P.; Nandi, R.
- Abstract
A new linear voltage-controlled oscillator (LVCO) implementation using single AD-844 CFA with a pair of AD-835 multiplier devices and a pair of grounded capacitors is proposed. The open-loop transfer function of the topology is analyzed wherein the concept of Short-Circuit Natural Frequency (SCNF) is applied to derive the sinusoid oscillator implementation. The proposed oscillator circuit is then restructured to yield a linear voltage-controlled quadrature oscillator (LVCQO) after appropriate cascade with a CFA-based active integrator. The oscillation frequency is linearly tunable ( f o ∼ 1 3. 2 MHz) by the multiplier control voltage (V). Subsequently, a high- Q selective band-pass (BP) filter is derived. Effects of the CFA port roll-off parameters and its parasitic capacitors ( C y , z) had been analyzed to be negligible. Measured oscillator response exhibited a THD ∼ 1. 8 %, a linearity error (Δ) ∼ 2. 4 % and a phase noise figure of (−) 104 dBc/Hz at 24-kHz offset.
- Subjects
ANALOG multipliers; VOLTAGE-controlled oscillators; PHASE noise; FREQUENCIES of oscillating systems; VOLTAGE multipliers; HARMONIC oscillators; QUADRATURE domains
- Publication
Journal of Circuits, Systems & Computers, 2022, Vol 31, Issue 6, p1
- ISSN
0218-1266
- Publication type
Article
- DOI
10.1142/S0218126622501110