Title :
A TV-PLL-circuit for automatic tuner alignment
Author_Institution :
Motorola Inc., Geneva, Switzerland
Abstract :
Modern highly integrated TV systems are MCU controlled (12C-bus) and replace mechanical adjustment by electronic alignment. The integrated circuit described has been developed for such a system. The IC contains all PLL functions that are required to control a TV local oscillator and also includes a D to A converter section that generates three further varicap voltages for optimum control of the tuner filters. The unique feature of the IC is that it generates the four varactor control voltages on chip in a range of up to 30 V and that it also contains the PLL functions that require high frequency operation (1.3 GHz).<>
Keywords :
bipolar integrated circuits; optimal control; phase-locked loops; television equipment; tuning; variable-frequency oscillators; voltage control; 0 to 30 V; 1.3 GHz; D to A converter; IC; MCU controlled; TV-PLL-circuit; UHF; automatic tuner alignment; electronic alignment; integrated circuit; local oscillator; optimum control; tuner filters; varicap voltages; Automatic control; Automatic generation control; Control systems; Filters; Local oscillators; Phase locked loops; TV; Tuners; Voltage control; Voltage-controlled oscillators;
Conference_Titel :
Consumer Electronics, 1988. Digest of Technical Papers. ICCE., IEEE 1988 International Conference on
Conference_Location :
Rosemount, IL, USA
DOI :
10.1109/ICCE.1988.10794
