INTEGRATED DIGITAL TELEVISION TUNER
First Claim
1. An integrated tuner for receiving a radio frequency (RF) signal, in a frequency band, which takes the form of at least one of a terrestrial TV signal, a cable TV signal, a digital data signal transmitted over a cable system, a terrestrial digital data signal, and a broadcast audio signal, comprising:
- 1. a first quadrature reference signal having a first frequency;
2. a second reference signal having a second frequency;
3. a first type-I single quadrature converter having a signal input coupled to the RF signal and a reference input coupled to the first quadrature reference signal, generating a first intermediate frequency (IF) signal at an output; and
4. a second converter having a signal input coupled to the first IF signal and a reference input coupled to the second reference signal, and generating a second IF signal at an output, wherein a center frequency of the second IF signal is in an approximate range of 0 Hz to one of a channel spacing of the RF signal;
whereby the first type-I single quadrature converter substantially relaxes design of RF stage circuitry.
0 Assignments
0 Petitions
Accused Products
Abstract
A highly integrated terrestrial and cable tuner for receiving digital television signals is disclosed. It achieves high performances in sensitivity, image rejection, dynamic range, channel selectivity and power consumption. The tuner first converts an RF input signal into a high-frequency first intermediate frequency (IF) using a single quadrature image rejection converter. Consequently, it significantly relaxes RF filter design. A second converter downconverts the first IF signal into either a baseband signal or a low-IF signal. The tuner can interface with a demodulator having the baseband and/or low-IF input interface. The tuner is integrated by using standard processes, with minimal off-chip components excluding SAW and LC filters. Small tuner modules cost less than discrete (can) tuners. They can be used in digital TV sets and portable/handheld TV devices.
-
Citations
20 Claims
-
1. An integrated tuner for receiving a radio frequency (RF) signal, in a frequency band, which takes the form of at least one of a terrestrial TV signal, a cable TV signal, a digital data signal transmitted over a cable system, a terrestrial digital data signal, and a broadcast audio signal, comprising:
-
1. a first quadrature reference signal having a first frequency;
2. a second reference signal having a second frequency;
3. a first type-I single quadrature converter having a signal input coupled to the RF signal and a reference input coupled to the first quadrature reference signal, generating a first intermediate frequency (IF) signal at an output; and
4. a second converter having a signal input coupled to the first IF signal and a reference input coupled to the second reference signal, and generating a second IF signal at an output, wherein a center frequency of the second IF signal is in an approximate range of 0 Hz to one of a channel spacing of the RF signal;
whereby the first type-I single quadrature converter substantially relaxes design of RF stage circuitry. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. An integrated tuner for receiving an RF signal, in a frequency band, which takes the form of at least one of a terrestrial TV signal, a cable TV signal, a digital data signal transmitted over a cable system, a terrestrial digital data signal, and a broadcast audio signal, comprising:
-
1. a first reference signal having a first frequency;
2. a second reference signal having a second frequency;
3. a first single quadrature converter having a signal input coupled to the RF signal and a reference input coupled to the first reference signal, generating a first IF signal at an output; and
4. a second converter having a signal input coupled to the first IF signal and a reference input coupled to the second reference signal, and generating a baseband signal at an output;
whereby the first single quadrature converter substantially relaxes design of RF stage circuitry. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification