By Topic

A new lock indicator circuit for microwave and millimeter-wave phase locked loops

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

1 Author(s)
J. B. I. Sau ; Univ. Politecnica de Catalunya, Spain

A circuit useful as a lock detector in microwave phase-locked loop (PLL) systems has been developed. This circuit avoids the quadrature phase detector or coherent amplitude detector commonly used as a lock indicator in PLLS, thereby reducing the microwave circuitry and components. It is based on the properties of the phase-error signal coming from the phase detector; a frequency-voltage conversion is performed on it in a low-frequency (secondary) PLL, the input to which is the output of the phase detector in the main (microwave) PLL. The secondary voltage-controlled oscillator (VCO) control signal gives, after a comparison, a logic level related to the lock condition in the main (microwave) PLL. This circuit has been used with success in microwave phase-locked oscillators (PLOs) in which the phase detection was made at 290 MHz, 2.55 GHz, 27 GHz and 29.7 GHz

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:36 ,  Issue: 9 )