scispace - formally typeset
Search or ask a question
Topic

Injection locking

About: Injection locking is a research topic. Over the lifetime, 4567 publications have been published within this topic receiving 60942 citations.


Papers
More filters
Journal ArticleDOI
I.R. Chamas1, Sanjay Raman
TL;DR: This paper presents the design, analysis, and characterization of a low-power, low-phase-noise, phase-tunable injection-coupled LC quadrature oscillator (PTIC-QVCO), a superharmonically coupled VCO that is driven to its optimum phase noise performance via a frequency doubler.
Abstract: This paper presents the design, analysis, and characterization of a low-power, low-phase-noise, phase-tunable injection-coupled LC quadrature oscillator (PTIC-QVCO). Two LC VCOs are superharmonically coupled in quadrature phase via a frequency doubler that injects a synchronizing signal at the common source node of the negative transconductor stage. Conceptual and analytical models of the circuit are introduced to derive the conditions for quadrature operation and examine the circuit parameters affecting the phase imbalance due to mismatched VCOs. Additionally, a tunable tail filter (TTF) is incorporated to calibrate the residual quadrature imbalance in presence of a 3-sigma variation in the device parameters and drive the oscillator to its optimum phase noise performance. To validate the proposed approach, measurements have been carried out on a 9 GHz prototype implemented in a 0.18 mum RF CMOS process. With core current consumption of 5 mA at 1.8 V supply voltage, the circuit achieves a measured phase noise figure-of-merit ranging from 177.3 to 182.6 dBc/Hz at 3 MHz offset along the 9.0 to 9.6 GHz frequency tuning range. Quadrature phase correction of plusmn110 at 9 GHz is demonstrated.

52 citations

Journal ArticleDOI
TL;DR: In this paper, a simple technique was proposed and demonstrated for controlling the phase of an optically-injection-locked 7.2 GHz FET oscillator by tuning the oscillator frequency.
Abstract: A simple technique is proposed and demonstrated for controlling the phase of an optically-injection-locked 7.2-GHz FET oscillator. The relative phase phi between the oscillator and the locking signal is adjusted by optically tuning the oscillator frequency. Locking characteristics described include locking bandwidth (2.6 MHz), phase tuning range (187 degrees ), phase modulation ( beta =0.69 at 500 kHz), and optical tuning (125 MHz). >

52 citations

Journal ArticleDOI
TL;DR: In this paper, a synchronous homodyne coherent optical receiver based on an optical phase-locking scheme that combines optical injection locking of the semiconductor laser local oscillator (LO) with low-speed electronic feedback to give both a large locking bandwidth and a wide tracking range is presented.
Abstract: We describe the operating principle, practical implementation, and experimental evaluation of a synchronous homodyne coherent optical receiver based on an optical phase-locking scheme that combines optical injection locking of the semiconductor laser local oscillator (LO) with low-speed electronic feedback to give both a large locking bandwidth and a wide tracking range. We demonstrate phase-error variance as low as 0.002 rad2 in 10-GHz bandwidth for locking to a continuous-wave (CW) signal for a combined signal and LO linewidth of 1.5 MHz (full-width at half-maximum), and robust phase locking to a 10-Gb/s binary amplitude-shift-keyed (ASK) signal, enabling synchronous back-to-back demodulation of the signal with low bit error ratio (BER <; 10- 10) and improved performance compared to direct detection at low optical SNR (OSNR). By locking to a low-power CW pilot carrier in the polarization orthogonal to the data signal, demodulation of binary phase-shift-keyed (BPSK) data has been achieved, with the required OSNR at BER = 10-3 reduced by 3 dB compared to demodulation of ASK data under the same conditions. The OSNR penalty after transmission of the ASK and BPSK signals over 40 km of standard single-mode fiber was 1-2 dB at BER = 10-3, indicating that the chromatic dispersion sensitivity of the coherent receiver is similar to that for direct detection, and verifying that the scheme for locking to the orthogonal pilot is applicable to transmission systems, provided that optical polarization tracking is employed. In addition, we demonstrate frequency-selective operation of the coherent receiver, demultiplexing and demodulating one of a pair of equal power, 10 Gb/s, ASK channels separated by 17.5 GHz, with OSNR penalty at BER = 10- 3 of 1.5 dB compared to single-channel operation.

52 citations

Patent
David C. Chu1
23 Jun 1978
TL;DR: In this paper, two triggered-phase oscillators, which are phase-locked to the reference oscillator, are used to supply the start and stop frequencies for phase shifting, which allows for pre-trigger frequency control, and essentially eliminates post trigger frequency drift which usually occurs when an oscillator is first started.
Abstract: Measurement of a time interval between a start and a stop event is made by activating a start oscillator in response to the start event and activating a stop oscillator in response to the stop event. The number of cycles of each respective oscillator signal which occur between the activation of each oscillator and the coincidence of the respective oscillator signal with that of an independent time base is determined. The number of cycles of the time base signal between the coincident points of it and the start and stop oscillator signal is also determined. These numbers, which are always integers, are used along with the values for the time base period and the difference in frequency between the time base oscillator and the start and stop oscillators to calculate the time interval. Resolution of the measurement is dependent on the frequency difference between the time base signal and the start and stop oscillator signals. Two triggered-phase oscillators, which are phase-locked to the reference oscillator, are used to supply the start and stop frequencies. The start trigger and stop signals are used for phase shifting, i.e., restarting of the oscillators rather than starting the oscillators. This allows for pre-trigger frequency control, and essentially eliminates post trigger frequency drift which usually occurs when an oscillator is first started. The coincidence signals are provided by the phase cross-over between the phase locked oscillator and the reference by a digital mixer.

52 citations

Journal ArticleDOI
Hyunwoo Cho1, Joonsung Bae1, Hoi-Jun Yoo1
TL;DR: An ultra-low power wake-up receiver for body channel communication (BCC) is implemented in 130 nm CMOS process that achieves a sensitivity of -62.7 dBm at a data rate of 200 kbps while consuming only 37.5 μW from the 0.7 V supply.
Abstract: An ultra-low power wake-up receiver for body channel communication (BCC) is implemented in 130 nm CMOS process. The proposed wake-up receiver uses the injection-locking ring oscillator (ILRO) to replace the RF amplifier with low power consumption. Through the ILRO, the frequency modulated input signal is amplified to the full swing rectangular signal directly demodulated by the following low power PLL-based FSK demodulator. In addition, the energy-efficient BCC link mitigates the sensitivity and selectivity requirements for the receiver, which significantly reduces the power consumption. Furthermore, the auto frequency calibrator (AFC) is adopted to compensate the free running frequency of the ring oscillator which is caused by temperature variation and leakage current. The AFC reuses the PLL-based demodulator to periodically set the free running frequency to the desired frequency without any area overhead. As a result, the proposed wake-up receiver achieves a sensitivity of -62.7 dBm at a data rate of 200 kbps while consuming only 37.5 μW from the 0.7 V supply.

51 citations


Network Information
Related Topics (5)
Amplifier
163.9K papers, 1.3M citations
91% related
Resonator
76.5K papers, 1M citations
90% related
Optical fiber
167K papers, 1.8M citations
87% related
CMOS
81.3K papers, 1.1M citations
85% related
Integrated circuit
82.7K papers, 1M citations
85% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202333
202276
2021107
2020145
2019169
2018146