Up/down converter
AssigneeAgilent Technologies, Inc.
InventorSatoshi Roppongi
Life of this patent
Estimating the term…
Abstract
The invention provides an up/down converter with low phase noise. Signals from a first local oscillator are fed through a power splitter to first and second mixers. Signals from a second local oscillator and signals from the power splitter are mixed by the second mixer. The frequency component of the difference between the two signals is removed by a first bandpass filter and passed to a third mixer. Input signals are mixed with signals from the power splitter by the first mixer, and the lower frequency component of the output signals from the first mixer is removed by a second bandpass filter and is passed to the third mixer. Signals from the first and second bandpass filters are mixed by the third mixer. The higher frequency component of the output signals is removed by a low pass filter and is output.
Claims20
An up converter comprising:
- a first local oscillator;
- a first mixer means for mixing input signals and signals from the first local oscillator and producing a frequency component of the sum of the two frequency signals;
- a second local oscillator;
- a second mixer means for mixing the signals from the first local oscillator and the second local oscillator and producing the frequency component of the sum of the two;
- and
- a third mixer means for mixing the signals from the first and second mixer means and producing the frequency component of the difference between the two signals.
An up converter comprising:
- a first local oscillator;
- a power splitter connected to the first local oscillator for splitting signals,
- a first mixer connected to one of outputs from the power splitter and input signals for mixing the signals from both;
- a first filter connected to the first mixer for removing the frequency component of the difference between two frequencies of the signals that have been input to the first mixer;
- a second local oscillator;
- a second mixer connected to the second local oscillator and another output from the power splitter for mixing the signals from both;
- a second filter connected to the second mixer for removing the frequency component of the difference between the signals that have been input to the second mixer;
- a third mixer connected to the first and second filters for mixing the signals from the two filters;
- and
- a third filter connected to the third mixer for removing the frequency component of the sum of two frequencies of the signals that have been input to the third mixer.
A down converter comprising:
- a first local oscillator;
- a second local oscillator;
- a first mixer means for mixing the signals from the second local oscillator with the signals from the first local oscillator and producing the frequency component of the sum of the two;
- an input terminal;
- a second mixer means for mixing the signals from the input terminal and the signals from the first mixer means and producing the frequency component of the difference between the two;
- and
- a third mixer means for mixing the signals from the first local oscillator and the signals from the second mixer means and producing the frequency component of the difference between the two.
The down converter comprising:
- a first local oscillator;
- a power splitter connected to the output of the first local oscillator for splitting signals;
- a second local oscillator;
- a first mixer connected with the second local oscillator and an output from the power splitter for mixing the two signals;
- a first filter connected with the first mixer for removing the frequency component of the difference between signals that have been input to the first mixer;
- an input terminal;
- a second mixer connected to the input terminal and the first filter for mixing signals from both;
- a second filter connected to the second mixer for removing the frequency component of the sum of signals input to the second mixer;
- a third mixer connected to another output from the power splitter and the second filter for mixing the signals from the two;
- and
- a third filter connected to the third mixer for removing the frequency component of the sum of signals input to the third mixer.
Dependencies are inferred from the claim text.