In an active frequency mixer, amplification is provided in addition to frequency conversion. The output is at a higher power level than the input, but downsides can be instability, noise and greater power consumption. Other mixer functions, besides frequency shifting, are modulator, phase detector and frequency multiplier.
modulation or information signal. Some circuits, such as mixers, are designed to trans-late signals from one frequency to another. To do so, they are driven by an additional signal, the LO, a large periodic signal the frequency of which equals the amount of fre-quency translation desired. For best performance, mixers are designed to respond in a
Aug 12, 2015 · Operating at the peak transconductance, we obtain short-circuit current-gain intrinsic cutoff frequency, fT, of 6.7 GHz and maximum intrinsic oscillation frequency, fmax, of 5.3 GHz for a device with a gate length of 250 nm. The MoS2 device afforded an extrinsic voltage gain Av of 6 dB at 100 MHz with voltage amplification until 3 GHz.
Demonstrates a single transistor RF mixer These kind of mixers are often used on retro discrete superheterodyne radios.
The LQ frequency is fixed at 483 MHz, because a commercial SAW oscillator at 483 MHz can be used as a local oscillator. If the RF frequency is swept from 433 to 633 MHz, then the IF frequency also is swept from 0 to 200 MHz. Compared to a passively loaded mixer, this combination of mixer and differential amplifiers exhibits excellent performance.
In 2012, I ended an article about frequency mixers (“Let’s Play with RF Frequency Mixers,” Circuit Cellar 263) by saying that I had only scratched the surface of the subject. In fact, I didn’t cover the important topic of so-called “I/Q” mixers in that article.
9 Mixers, switches, modulators, and other control circuits 553 f What is a mixer? 553 9.1 Mixer fundamentals 553 9.2 Mixer specification 566 9.3 Mixer topologies 569 9.4 Design methodology for downconverters 586 9.5 Upconverter mixer design methodology 588 9.6 Examples of mm-wave Gilbert cell mixers 589
The mixerdevice is assembled from any number of junctions, a radio-frequency (RF) linear circuit, and an intermediate-frequency (IF) linear circuit. These circuits can be arbitrarily complicated and can contain arbitrary numbers of ports. The local oscillator (LO) can be injected anywhere in the RF linear circuit.