INTERMEDIATE FREQUENCY RECEIVING CIRCUIT AND INTERMEDIATE FREQUENCY RECEIVING METHOD
First Claim
1. An intermediate frequency receiving circuit, comprising:
- an inductor-capacitor (LC) resonance circuit, whose primary resonance frequency is substantially equal to a central frequency of received signals, and adapted to receive intermediate frequency signals and suppress transmitted signals and control signals;
a band-pass filter, connected to the LC resonance circuit, and adapted to filter the transmitted signals and control signals;
an automatic gain control circuit, connected to the band-pass filter, and adapted to compensate the attenuation of an intermediate frequency cable;
a low-pass filter, connected to the automatic gain control circuit, and adapted to compensate an in-band flatness; and
an analog-to-digital converter, connected to the low-pass filter, and adapted to perform a sampling and digital demodulation on the received signals.
1 Assignment
0 Petitions
Accused Products
Abstract
An intermediate frequency receiving circuit and an intermediate frequency receiving method are provided. The intermediate frequency receiving circuit includes an inductor-capacitor (LC) resonance circuit whose primary resonance frequency is a central frequency of received signals. The LC resonance circuit receives intermediate frequency signals and suppresses transmitted signals and control signals. A band-pass filter connected to the LC resonance circuit filters the transmitted signals and control signals. An automatic gain control circuit connected to the band-pass filter compensates the attenuation of an intermediate frequency cable. A low-pass filter connected to the automatic gain control circuit compensates an in-band flatness. An analog-to-digital converter connected to the low-pass filter performs a sampling and digital demodulation on the received signals.
9 Citations
19 Claims
-
1. An intermediate frequency receiving circuit, comprising:
-
an inductor-capacitor (LC) resonance circuit, whose primary resonance frequency is substantially equal to a central frequency of received signals, and adapted to receive intermediate frequency signals and suppress transmitted signals and control signals; a band-pass filter, connected to the LC resonance circuit, and adapted to filter the transmitted signals and control signals; an automatic gain control circuit, connected to the band-pass filter, and adapted to compensate the attenuation of an intermediate frequency cable; a low-pass filter, connected to the automatic gain control circuit, and adapted to compensate an in-band flatness; and an analog-to-digital converter, connected to the low-pass filter, and adapted to perform a sampling and digital demodulation on the received signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. An intermediate frequency receiving method, comprising:
-
receiving intermediate frequency signals and suppressing transmitted signals and control signals; performing a band-pass filtering on the intermediate frequency signals with the transmitted signals and control signals being suppressed; performing an automatic gain control on the band-pass filtered intermediate frequency signals; performing a low-pass filtering on the automatically gain-controlled intermediate frequency signals; and performing an analog-to-digital conversion on the low-pass filtered intermediate frequency signals. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
-
Specification