Multistaged frequency conversion with single local oscillator
First Claim
Patent Images
1. A multistage low-IF receiver which can be readily integrated, comprising:
- a first frequency down conversion stage comprising a first mixer, said first mixer being configured to down-convert a radio frequency signal having a carrier frequency fA received by said receiver to a first lower frequency signal, a second frequency down conversion stage comprising a second mixer, said second mixer being configured to down-convert said first lower frequency signal to a second lower frequency signal in or close to the baseband of the receiver, a single local oscillator, said oscillator having a frequency fLO that is higher than fA, a first frequency divider that is directly connected between an output of said oscillator and an input of said first mixer, and a second frequency divider that is coupled between said oscillator and an input of said second mixer, said receiver having a single phase locked loop, said phase locked loop including said oscillator and at least one of said first and second frequency dividers.
5 Assignments
0 Petitions
Accused Products
Abstract
A frequency conversion circuit has a first frequency conversion stage with a first mixer, a second conversion stage with a second mixer, an oscillator, a first frequency divider, and a second frequency divider. The first frequency divider is directly connected between the oscillator and an input of the first mixer. The second frequency divider is coupled between the oscillator and an input of the second mixer. The first and second frequency dividers can either be connected in series or parallel.
-
Citations
13 Claims
-
1. A multistage low-IF receiver which can be readily integrated, comprising:
-
a first frequency down conversion stage comprising a first mixer, said first mixer being configured to down-convert a radio frequency signal having a carrier frequency fA received by said receiver to a first lower frequency signal, a second frequency down conversion stage comprising a second mixer, said second mixer being configured to down-convert said first lower frequency signal to a second lower frequency signal in or close to the baseband of the receiver, a single local oscillator, said oscillator having a frequency fLO that is higher than fA, a first frequency divider that is directly connected between an output of said oscillator and an input of said first mixer, and a second frequency divider that is coupled between said oscillator and an input of said second mixer, said receiver having a single phase locked loop, said phase locked loop including said oscillator and at least one of said first and second frequency dividers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
Specification