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A Method For Improving Analog / Digital FM modulation
Transmitted Signal Quality By Using Controlled Escort Phase Locked Loop (PLL)
and Dual Port Modulation
Moshe Ben-Ayun, Mark Rozental, Haim Friedlander,
circuit for improving phase error performance in a PLL.
is important that the delays in the low port and high port paths are
compensated so that they combine in phase and minimize distortion in the
modulated FM signal. Amplitude mismatch can cause phase distortion to the
phase error can be improved by using ESCORT PLL configuration. Controlling the
main Voltage Controlled Oscillator (VCO) setting for a limited frequency band,
while changing the ESCORT NUD in order to synthesize the desired TX frequency.
Limiting the main VCO frequency band will improve the VCO sensitivity changes,
which will improve the dual port mismatch. Improving dual port mismatch will
lead to an improvement in the phase error over the frequency band.
1. Enables improved phase
2. Enables multi modulation
applications without the need in extra HW.