US 7,890,081 B2 · Direct frequency conversion demodulator and modulator-demodulator

Abstract

The demodulator by direct frequency conversion comprises a vector addition device having: a first circuit (1) that furnishes, starting from a first AC signal (LO), a respective AC signal to n outputs that are not all of the same amplitude and of the same frequency, but are out of phase with regard to one another in such a manner that each one is not either in phase nor in opposite phase with any other; a second circuit (2) that splits a second AC signal (RFin) toward n outputs; a number n of summers (3a, 3b, 3c) each receiving, at the input, a respective output of the first circuit (1) and a respective output of the second circuit (2), and; a respective power sensor (4a, 4b, 4c) for each summer, whereby the number n is greater than or equal to 3. The demodulator also comprises digital processing means (5, 6) that furnish the result of the demodulation.

Claims20

Dependent claims

A device comprising:

a first circuit configured to split a first electrical signal into a first set of n electrical signals, wherein each of the n electrical signals in the first set is phase shifted relative to other electrical signals in the first set, wherein the first circuit comprises n amplifiers;
a second circuit configured to split a received modulated electrical signal into a second set of n electrical signals;
and
n summing circuits, wherein each of the n summing circuits is configured to sum one electrical signal from the first set of n electrical signals with one electrical signal from the second set of n electrical signals to generate n output signals for use in demodulating the received modulated electrical signal.

1 more element

Dependencies are inferred from the claim text.

Direct frequency conversion demodulator and modulator-demodulator

Life of this patent

Direct frequency conversion demodulator and modulator-demodulator

Life of this patent

Abstract

Claims20