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Phased
Locked Loop (PLL) Circuits, Page
2
PLL's: #'s - A B - O
PQ - Z Last Updated on:
Friday, March 12, 2010 12:07 PM
Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
Barker Code-Locked Loop Synchronous Demodulator - A simple, low component
count phase locked loop that locks onto and detects the amplitude of an incoming
base band 7 bit Barker code using a switched resistor demodulator that is driven
directly by a microcontroller's output pins…(circuit added 6/07)
BIAS COMS PLL transmitter - This schematic originally comes from Bias Comms
and was originally intended for use in combination with a BGY33 or BGY133 module.
The PLL is very straightforward and should not be too difficult to build.
….(design added 11/08)
Improved CMOS RF Synthesizer - Lock range extended up to about 400:1 (50KHz,
2MHz). Spectral purity improved, reduced reference frequency FM ripple. Output
level buffered to over 200mW RF power output. Unecessary DIP switches removed,
silly combinations not possible. BMP format single-sided PCB foil available for
downloading. External VCO/Prescaler PCB to follow shortly (up to 150MHz)
….(electronic schematic added 11/08)
Low cost Programmable Oscillator operates at 2 GHz - 05/11/00 EDN-Design Ideas:
All wireless communication systems need a local oscillator. Figure 1 shows a low-cost
PLL circuit for the 2-GHz band for such applications as industrial, scientific, and
medical (ISM)and satellite personal-communication systems (S-PCS). The
central.....(design idea added 7/03)
MC145151 PLL FM Transmitter - This PLL has been designed with an old Motorola
circuit :the MC145151. The VCO is based on a "Colpitz" oscillator equiped with a Fet
Transistor.(J310) Two varicap Diodes are used in order to reduce the global noise of
the VCO. In addition,these two diodes allow the PLL to keep the lock status through a
large range of climatic conditions. An another J310 is used in order to match the
impedance between the oscillator and the fist amplifier stage. A MSA1105 from
Minicircuits increases the RF power level coming from the VCO to +14dBm. A simple low
pass filter rejects the second harmonic to -20 dB.(Worst case) Finally, a 7 dB
attenuator and a second amplifier stage (BFR96S) achieve this radio design. ….(circuit
design added 11/08)
MC145170 PLL FM Transmitter - In order to simplify the transmitter design, we've
used the new pll circuit from Motorola :the MC145170. This PLL includes the prescaler
and a serial standard bus called SPI. (circuit added 04/05/06)
New Phase Locked Loops - National Semiconductor Application Note 04-Nov-1995 (app
note added 4/02) Have advantages as frequency to voltage converters & more