Hybrid DAC suitable for use in a GPS receiver

Details Hybrid DAC suitable for use in a GPS receiver Hybrid DAC suitable for use in a GPS receiver

1996-04-05

1998-06-09

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

701213, H03M 166

Patent

active

057641722

ABSTRACT:
An apparatus including a hybrid digital-to-analog converter (DAC) (10) for converting a combined digital word (23) into a combined analog output level (21) and a GPS receiver (36) for providing the combined digital word (23) and using the combined analog output level (21) for phase locking a voltage controlled oscillator (VCO) (40) to a GPS satellite signal (34). The combined digital word (23) includes a more significant (MS) digital word (13) having N bits and a less significant (LS) digital word (15) having M bits. The hybrid DAC (10) includes a pulse generator DAC (12) for converting the MS digital word (13) into pulse output signal having a duty cycle and an average MS analog level representative of the MS digital word (13) and a second DAC (14) for converting the LS digital word (15) into an average LS analog level representative of the LS digital word (15). The pulse generator DAC (12) uses a counting technique in order to obtain a high degree of precision. A filter/combiner (18) filters and combines the average MS and the LS analog levels into a combined analog output level (21) representative of the combined digital word (21) to control the VCO (40) for providing a GPS-derived frequency signal (41) and a VCO signal to a correlator (38). The correlator (38) provides the combined digital word (23) representative of a difference between the frequency of the VCO signal and the frequency of the GPS satellite signal (34).

REFERENCES:
patent: 4998108 (1991-03-01), Ginthner et al.
patent: 5440313 (1995-08-01), Osterdock et al.

Affiliated with

Also associated with

Rating

Hybrid DAC suitable for use in a GPS receiver does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Hybrid DAC suitable for use in a GPS receiver, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hybrid DAC suitable for use in a GPS receiver will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2205245