scholarly journals Current feedback op-amp based linear voltage-controlled oscillator using analog multipliers and minimum passive components

2016 ◽  
Vol 23 (3) ◽  
pp. 1294-1300 ◽  
Author(s):  
W. Jaikla ◽  
A. Lahiri
Keyword(s):  
Voltage Controlled Oscillator ◽  
Current Feedback ◽  
Passive Components ◽  
Op Amp ◽  
Analog Multipliers ◽  
Linear Voltage

Linear voltage controlled oscillator

1988 ◽  
Vol 37 (1) ◽  
pp. 148-150 ◽  
Author(s):  
S.K. Saha ◽  
L.C. Jain
Keyword(s):  
Voltage Controlled Oscillator ◽  
Linear Voltage

ENRICHED DYNAMICS OF A SIMPLE NONLINEAR NONAUTONOMOUS PARALLEL LCR CIRCUIT

2009 ◽  
Vol 19 (07) ◽  
pp. 2347-2358 ◽  
Author(s):  
I. MANIMEHAN ◽  
K. THAMILMARAN ◽  
P. PHILOMINATHAN
Keyword(s):  
Period Doubling ◽  
Nonlinear Element ◽  
Chaotic Oscillator ◽  
Passive Components ◽  
Op Amp ◽  
Rich Variety ◽  
Analytical Results ◽  
Farey Sequences ◽  
Torus Breakdown ◽  
Junction Diode

We present the results of a very simple nonlinear nonautonomous parallel LCR circuit which exhibits a rich variety of bifurcations and chaos. This simple experimental chaotic oscillator is made up of a few passive components and a uniquely designed nonlinear element comprising of a junction diode and Op-amp based negative conductor. The system exhibits a rich dynamics such as chaos via torus breakdown, period-doubling, period three-doubling, period-adding, Farey sequences, etc., and the results of the investigation are vividly presented along with experimental, numerical and analytical evidences. The laboratory experimental outcomes are in agreement with the numerical and analytical results.

scholarly journals Current mismatch reduction in charge pumps using regulated current stealing-injecting transistors for PLLs

2021 ◽  
Vol 24 (1) ◽  
pp. 61
Author(s):  
Mohd Khairi Zulkalnain ◽  
Yan Chiew Wong
Keyword(s):  
Metal Oxide ◽  
Supply Voltage ◽  
Channel Length ◽  
Feedback Mechanism ◽  
Phase Locked Loops ◽  
Voltage Controlled Oscillator ◽  
Op Amp ◽  
Compensation Technique ◽  
A Charge ◽  
Low Supply Voltage

A charge pump for phase locked loops (PLL) with a novel current mismatch compensation technique is proposed. The proposed circuit uses a simple yet effective current stealing-injecting (CSI) technique and feedback to reduce mismatch between the negative-channel-metal-oxide (NMOS) and positive-channel-metal-oxide (PMOS) transistors. The current stealing transistor steals the current from a replica branch and mirrors it to the output where it is added to the output branch by the injecting transistor. A feedback mechanism is used to set the drain voltages of both branches to be equal and mitigate channel length modulation and ensure high accuracy. The proposed circuit was designed on Silterra 130nm technology and simulated using Cadence Spectre. The simulation results show that the proposed circuit yields a maximum of 0.107% and minimum of 0.00465% current mismatch while operating at a low supply voltage of 800mV for a range of 100mV to 700mV. The proposed design uses only one rail-to-rail op amp for compensating the mismatch and an addition of 4 transistors and utilizing 75% of the supply voltage for high voltage controlled oscillator (VCO) tuning range.

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