Method and apparatus for receiving and/or down converting high frequency signals in multi mode/ multi band applications, using mixer and sampler
First Claim
1. A circuit comprising means of down converting high RF signals to base band by means of a hybrid mixer/sampler wherein the mixer uses a LO frequency related to the sampling frequency by an integer.
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Abstract
A method and apparatus to receive and down convert high frequency radio signals to low frequency or base band frequency is disclosed. A mixer used with a sampler produces a multi mode/multi band software enhanced radio receiver capable of supporting multiple air interfaces. The local oscillator of the disclosed mixer is harmonically related to the sampler frequency. A signal is first down converted by the mixer to a lower frequency or intermediate frequency, the signal is then sub sampled by the sub sampler, the signal is then converted to discrete time and all further processes are discrete. Successive decimation, filtering and demodulation in discrete or continuous time achieve selectivity and down conversion to base band.
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Citations
20 Claims
- 1. A circuit comprising means of down converting high RF signals to base band by means of a hybrid mixer/sampler wherein the mixer uses a LO frequency related to the sampling frequency by an integer.
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14. A method for down converting high frequency FR signals to base band through the use of a hybrid mixer/sampler where the mixer LO frequency is related to the sampling frequency by an integer (fLO=n*fS), and the mixer/sampler sampling frequency is placed at a multiple of the desired IF signal center frequency;
- for a high-side LO injection, the sampling frequency is (fS=L*(fLO−
fRF)=L/(L*n−
1)*fRF), and for a low-side LO injection, the sampling frequency is (fS=L/(L*n+1)*fRF). - View Dependent Claims (15, 16, 17, 18, 19, 20)
- for a high-side LO injection, the sampling frequency is (fS=L*(fLO−
Specification