What is meant by direct conversion?
What is meant by direct conversion?
A direct-conversion receiver (DCR), also known as homodyne, synchrodyne, or zero-IF receiver, is a radio receiver design that demodulates the incoming radio signal using synchronous detection driven by a local oscillator whose frequency is identical to, or very close to the carrier frequency of the intended signal.
What are the disadvantages of direct conversion?
The first drawback of direct conversion receiver is DC offset. DC offset is coming from local oscillator leakage. The local oscillator leakage problem causes large DC offset in the base band and saturates the baseband circuits.
What is direct RF sampling?
In a direct RF-sampling architecture, the data converter digitizes a large chunk of frequency spectrum directly at RF and hands it off to a signal processor to dissect the available information.
What is a direct conversion transmitter?
Abstract: Direct-conversion is an alternative wireless receiver architecture to the well-established superheterodyne, particularly for highly integrated, low-power terminals. Its fundamental advantage is that the received signal is amplified and filtered at baseband rather than at some high intermediate frequency.
What are the advantages of direct conversion?
To be sure, a major advantage of direct-conversion is the simplicity. Directly down converting from RF to baseband leads to multiple benefits, including lower cost, smaller circuit-board area, reduced component count, and a roadmap to ongoing cost reductions over time.
How does a direct conversion receiver work?
Direct-conversion receivers typically filter and amplify a received RF input signal. The signal then enters a mixer along with a local-oscillator (LO) signal that is identical in frequency to the RF input signal. Thus, the input signal is converted to a 0-Hz signal that appears at the output of the mixer.
What is direct energy conversion system?
Direct energy conversion (DEC) or simply direct conversion converts a charged particle’s kinetic energy into a voltage. It is a scheme for power extraction from nuclear fusion.
What are the different system conversion strategies?
Direct Conversion 2. Parallel conversion 3. Modular Conversion 4. Phase-In Conversion.
What is the difference between heterodyne and homodyne?
The basic difference between Homodyne and Heterodyne Detection is based on the signal carrier and local oscillator frequency. In homodyne detection signal carrier and local oscillator frequency is equal i.e. ωif = 0 and In heterodyne detection signal frequency and carrier frequency are not equal i.e. ωif ≠0.