Modulator based on electronic change of phase shift in simple oscillator

In this study, we propose phase shift keying system using an oscillator based on two all-pass filters. The main idea is based on phase commutation by converted data to two pairs of DC control voltages for controlling both all-pass sections. Therefore, the proposal of converter of data to DC control voltages is solved with precise amplitude automatic gain control circuit. The system operation was verified while employing commercially available devices through PSPICE program at the modulation frequencies 1 MHz and 10 kHz with driving signals 0 V (L) and 5 V (H), respectively. The simulation results confirmed the theoretical presumptions.

[1]  Ahmed S. Elwakil,et al.  On the Realization of Multiphase Oscillators Using Fractional-Order Allpass Filters , 2012, Circuits Syst. Signal Process..

[2]  Montree Kumngern,et al.  Electronically tunable multiphase sinusoidal oscillator using translinear current conveyors , 2010 .

[3]  Jan Jerabek,et al.  Features of multi-loop structures with OTAs and adjustable current amplifier for second-order multiphase/quadrature oscillators , 2015 .

[4]  Wanlop Surakampontorn,et al.  Integrable electronically tunable current conveyors , 1988 .

[5]  Dalibor Biolek,et al.  Voltage-mode electronically tunable all-pass filter employing CCCII+, One capacitor and differential-input voltage buffer , 2010, 2010 IEEE 26-th Convention of Electrical and Electronics Engineers in Israel.

[6]  U. E. Ayten,et al.  Current and voltage mode multiphase sinusoidal oscillators using CBTAs , 2013 .

[7]  Jan Jerabek,et al.  Quadrature oscillator solution suitable with arbitrary and electronically adjustable phase shift , 2015, 2015 IEEE International Symposium on Circuits and Systems (ISCAS).

[8]  Pipat Prommee,et al.  Log-domain all-pass based multiphase sinusoidal oscillator , 2012, 2012 35th International Conference on Telecommunications and Signal Processing (TSP).

[9]  Alain Fabre,et al.  Class A/AB second-generation current conveyor with controlled current gain , 1994 .

[10]  Ahmed S. Elwakil,et al.  Novel Approximate Square-Root Domain All-Pass Filter with Application to Multiphase Oscillators , 2006 .

[11]  R. Sotner,et al.  Voltage Differencing Buffered/Inverted Amplifiers and Their Applications for Signal Generation , 2013 .

[12]  Erhan Hancioglu,et al.  Resistorless first-order all-pass filter with electronic tuning , 2008 .

[13]  D. R. Frey,et al.  Log-domain filtering: An approach to current-mode fil-tering , 1993 .

[14]  Ahmed M. Soliman,et al.  OTA-C Arbitrary-Phase-Shift Oscillators , 2012, IEEE Transactions on Instrumentation and Measurement.

[15]  Dalibor Biolek,et al.  Current mode quadrature oscillator using current differencing transconductance amplifiers (CDTA) , 2006 .

[16]  Worapong Tangsrirat,et al.  Current-mode multiphase sinusoidal oscillator using CDTA-based allpass sections , 2009 .