Semiconductor integrated circuit having VCO coupled through capa

Details Semiconductor integrated circuit having VCO coupled through capa Semiconductor integrated circuit having VCO coupled through capa

1995-11-29

1997-11-11

Grimm, Siegfried H.

Oscillators

Combined with particular output coupling network

Space discharge or unilaterally conductive device in output...

331 8, 331108C, H03B 100

Patent

active

056868685

ABSTRACT:
A semiconductor IC used for synthesizer having a phase locked loop PLL, a voltage controlled oscillator (VCO) and a mixer (MIX) for intermediate frequency is formed on a one chip silicon wafer. A semiconductor IC used for synthesizer having a VCO portion and an internal circuit such as PLL on a silicon wafer chip includes a differential buffer circuit which separates the VCO portion from the internal circuit. A capacitor (C1) is connected to an output of the VCO portion. A constant voltage source (V1) may be connected to respective input of the differential transistors (Q4, Q5). Transistors (Q6,Q7) provide emitter follower output circuits in the differential buffer. Respective emitters of the transistors (Q6,Q7) are connected to corresponding constant current sources (I1,I2).

REFERENCES:
patent: 3886458 (1975-05-01), Matsumoto etal.
patent: 4622681 (1986-11-01), Snell et al.

Affiliated with

Also associated with

Rating

Semiconductor integrated circuit having VCO coupled through capa does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Semiconductor integrated circuit having VCO coupled through capa, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Semiconductor integrated circuit having VCO coupled through capa will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1232340