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With the increasing demand for high frequency oscillator, low cost CMOS circuit is of crying need. Periodic steady state behavior of cross-coupled LC tank is important as it helps to get oscillation in ultra-low power, low voltage. This study is about evaluating the amplitude of main component, oscillation frequency, non-linear behavior of oscillator, and power consumption of LC-tank VCO. The proposed...
This paper presents a wide-operating range analog phase locked loop (PLL) constructed from all-digital integrated circuit (IC) process components. Specifically, this work introduces 2 cutting-edge, scalable analog circuit designs for a charge pump (CP) and a voltage controlled oscillator (VCO). The ultra-low power and highly accurate CP circuit uses 6 minimum-sized transistors, a small metal interconnect...
An octa-phase differential relaxation VCO generating both triangular and rectangular waveform outputs is designed for 8-PSK subcarrier generation in FM-UWB transceiver systems. The VCO consists of cascaded quad-phase relaxation oscillators in which the second stage oscillator provides 45° phase shifting with pseudo injection locking. The 5.2-11.8MHz octa-phase VCO implemented in 0.18μm CMOS consumes...
A new low power divide-by-3 injection locked LC divider is proposed for PLL-based frequency synthesizers. The circuit is made of two voltage controlled oscillators coupled together via four MOSFETs, where capacitors are placed in series with the source of the coupling transistors leading to a reduction in power consumption. The control voltage of the two VCOs are tied together to achieve a wider locking...
This paper presents a low power voltage controlled oscillator (VCO) with the phase noise enhancement techniques. To reduce the phase noise of VCO, a bias filter consists of inductor and capacitor is used to suppress noise. Moreover, the source of tail current uses a memory reduced tail transistor to procure low power consumption and avoids degradation of phase noise. The Q-enhancement technique without...
This paper presents a Colpitts current-reused quadrature voltage-controlled oscillator (QVCO) based on capacitor coupling in TSMC 0.18um CMOS 1P6M process technology. Comparing to conventional parallel-coupled QVCO (P-QVCO), the proposed QVCO achieves a better phase noise and phase accuracy. The proposed QVCO operates from 4.57GHz to 5.02GHz. The measured phase noise at 1MHz offset frequency is −119...
A millimeter-wave CMOS frequency multiplier by two (doubler) is reported. The circuit consists of a Pierce oscillator injection-locked by a push-push pair. Compared to traditional frequency multipliers, which exploit the non-linearity of active devices to produce harmonics of the input signal, this technique provides a differential output with balanced signals, low core power dissipation and large...
On-chip frequency generators for high frequency applications suffer from degradation of key passive components, variable capacitors in particular. In this framework, frequency multipliers can play a key role, allowing the design of voltage-controlled oscillators running at a frequency lower than required with advantage in terms of signal spectral purity and frequency tuning range. In this paper we...
In conventional CMOS charge pump circuits, there are some non-ideal effects such as the clock feedthrough, current mismatch and charge sharing which result in a phase offset in phase-locked loop circuits. This paper presents a new charge pump to reduce the jitter. The proposed and conventional charge pumps are simulated and compared. The circuit is implemented using a 0.35??m mix-signal CMOS process...
This paper presents an ultra low power pulse generator based on special design of a voltage controlled ring oscillator (VCRO). This pulse generator can be used as a capacitive sensor interface for MEMS applications with the advantage of using short pulse width to achieve lower power consumption and high sensitivity for low capacitance. The pulse frequency can be controlled by voltage bias. The design...
In this paper, quadrature VCO adopts back-gate coupling instead of coupling transistor topology to get low phase noise and low power consumption. The 2-bit switch capacitor arrays and two MOS varactors are used to widen the frequency range in the band tuning circuit. As a result, the proposed LC quadrature VCO shows excellent performances of power consumption and phase noise for the frequency band...
In the paper a circuit implementation of CMOS voltage controlled oscillator is presented. The most interesting feature of the presented proposal is extreme low voltage suitability, because CMOS inverters are used as main building blocks. The simulation results with real foundry parameters are also included.
A method for multiphase signal generation by means of coupling several identical cross-connected LC-VCOs via capacitors is presented. An analysis is presented which shows that there is a 180/N degrees phase difference between the outputs when N identical oscillators are coupled to each other. Since there is no noise and power consumption introduced by the coupling capacitors, the circuit has a better...
The next generation of wireless communication is a ubiquitous radio system concept, providing wireless access from short-range to wide-area, with one single reconfigurable and adaptive system for all envisaged radio environments. This paper presents the design approach of RCO (reconfigurable concurrent oscillator) that simultaneously generates two or more signals of different frequencies that eliminate...
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