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 … See more The conversion of the modulated signal to baseband is done in a single frequency conversion. This avoids the complexity of the superheterodyne's two (or more) frequency conversions, IF stage(s), and image rejection … See more The homodyne was developed in 1932 by a team of British scientists searching for a design to surpass the superheterodyne (two stage … See more • The History of the Homodyne and Syncrodyne The Journal of the British Institution of Radio Engineers, April 1954 • U.S. Patent 706,740, "Wireless Signaling" (heterodyne principle) – 12 August 1902 - by Reginald Fessenden See more To match the performance of the superheterodyne receiver, a number of the functions normally addressed by the IF stage must be accomplished at baseband. Since there is no high gain IF amplifier utilizing automatic gain control (AGC), the baseband output … See more • Crystal radio • Reflectional receiver • Harmonic mixer • Homodyne detection • Low IF receiver See more WebSoftware-defined radio (SDR) provides a re-usable and "future-proof" radio platform by combining an RF-to-baseband transceiver PHY and a digital processor. Among SDR's many advantages include software-configurability and control, improved system performance, reduction in system size, and minimization of design risk and time-to-market.
Direct Conversion Receivers: A Buyer
Webwith a typical conversion loss of 4-6 db in practice. Conversely, this design is not a mixer, but rather can best be described as a “switching integrator”, ... Suppose a 1 KHz detection bandwidth is desired for a 7 MHz receiver. If Rsys is 50 ohms, and both R and Rswitch are assumed to be zero, a detection C of 1.33 uf yields a 3 db lowpass ... WebDirect Conversion Receiver IC: 100 - 940 >1: 11: 5: 49: 3.0 - 3.6: 56: 40-VQFN: Very high IIP2 for true-zero IF DCRx use, low power, complete LNA to zero-IF receiver path, IF filter, gain controls, flexible LO divider for Tx and Rx synth with VCO amp: CMX994A: Low Power Direct Conversion Receiver IC: sonic 2.5 inch figures wave 4
I/Q Modulators and Demodulators Analog Devices
WebA 2-GHz direct-conversion receiver for wide-band code division multiple access (WCDMA) is presented. It includes two low-noise amplifiers (LNAs), an I/Q demodul A 1.5-V 45-mW … WebThe QRPGuys Lidia 40m Direct Conversion Receiver is the creation of SP5DDJ and he has dedicated it to the memory of his wife Lidia. Wim has granted permission for us to produce it as a kit. We are offering it on … WebAs mentioned in the previous page, a direct-conversion receiver shifts the received signal all the way to baseband instead of to an intermediate frequency. In other words, the frequency of the VFO is always equal to the center frequency of the desired spectrum: This approach includes one very important benefit—it eliminates the image problem. sonic 2.99 carhop classic