Homodyne receivers Essay Example | Topics and Well Written Essays - 500 words

Homodyne receivers - analyze ExampleThe architecture of homodyne receiver comprises the basic RF circuits which ensure the work flow of the equipment namely rope Select Filter (BSF), Low-noise amplifier (LNA), active mixer, oscillator and a Channel Select Filter (HFS, 2008). LNA is an amplifier which converts the received signal to delicious levels while minimizing the noise. (Varma,Kunder,Daruwalla,2003). The active mixers are responsible for frequency up variety and down conversion brings(Beckwith, Schiltz, 2003) where as Oscillator generates a series of waves which is mixed with the RF signals (Fukatsu, 2005). Channel Select Filter converts preferred low world-beater RF signal into significantly powerful ones.The primary principle of operation of a direct conversion receiver, is the down-conversion of incoming RF signal to base-band in one step by mixing with an oscillator output of the same(p) frequency and hence the name homodyne receiver. The resulting zero frequency sign al is then riddleed with a low-pass filter to select the desired channel. (Ma,2001). This process of operation has been illustrated in the following diagram.The simplicity in its constitution and function is the prime advantage of this type of receivers. With relevance to the changing performance and functionality requirement for the emerging technologies, the homodyne model becomes more(prenominal) practical to implement.The major disadvantage of homodyne receiver is that the down-converted signal is extremely sensitive to DC voltage offsets receivable to current leakage from the local oscillator entering into the LNA and mixer. This demands high requirements on reverse isolation and low substrate coupling. Moreover because of the down-conversion of the RF signal to zero IF, the noise in the oscillator must be minimized and the overrefinement or linearity must be kept very low for the LNA and mixer. This causes power dissipation as well. (HFS,