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89 Threads found on Input Signal Mixer
Going to the original question: "Can you tell me are two gate's are interchangeable?" The answer is: Depends by your application. Originally the Dual-Gate MOSFET was invented to get a gain-controlled device (input signal on G1, and DC gain-control on G2). Also this device can be used as an RF mixer, applying two RF (...)
I have a question on the effect of IM2 vs IM3 in I or Q-channel individually, versus at complex baseband: In a quadrature downconverter, assume each path (I or Q) contains an LNA and mixer which contribute IP3 or IP2. The IM3 from the LNA is at the input to the mixers, so the IM3 along with the signal undergo complex (...)
Hello, I am looking for a discrete device for this function. I would call it a mixer with large bandwidth DC-9 GHz but it does not exist. I think about a RF switch, but it is complicate to inverse the input signal. In a paper I read, it is called Code modulating LNA, where the Vdd can be positive or negative. Do you have any (...)
Is nothing wrong with your simulation. This a normal behavior of the conversion loss vs LO input power in a mixer design. But I think there is a spelling mistake in your post. You mentioned twice about IF input power. Actually IF should be an output signal, which results from mixing RF input (...)
I meant the tail transistor. Sorry about the typo. For higher linearity, input gm must be as linear as possible.
mixers are generally driven hard by LO port and impedance matching is not necessary because input impedance is very variable at LO port due to hard driven rail to rail swing signal level.Matching can be considered for RF/IF port so small signal input impedance can be taken into account.However matching is (...)
Your adapter has a direct short circuit between the left and right channels on the 6.35mm plug then unshielded wires (they pickup mains hum and other interference) to a 3.5mm plug on the mic input tip. The direct short circuit can destroy your signal source. A mixer circuit should be used which can be two resistors. Shielded audio cables are (...)
input Matching is simply like LNA matching so Conjugate Matching.LO port is hardly driven so it doesn't need matching. Output Matching can be done by obtaining large signal output impedance ( Large signal S-Parameters ) then apply a proper Conjugate Matching or Harmonic Matching that decreases harmonic contents at the output.( It's a little (...)
Hi, I have designed a PLL that can output square waves as well as sine waves (by adding filters). The signal of the PLL should go to a mixer that will transmit the LO+ signal when its data input is '1' and transmit LO- signal when data input is '0'. Overall the output of the (...)
I guess you're working on a I/Q Demodulator, right ?? If it's so, characterizing I/Q outputs is not very interesting( relatively low frequency) .If LO level is sufficiently high, LO port can be neglected.( Matching is not must because this port is hardly driven) For RF input, you'll need a-at least-small signal s-parameters to match to LNA output.
Because you still get the mixing process, but with gain about 15dB lower than should be, for me looks like one of the RF or LO inputs lost the balanced configuration. The gain of the mixer is easy to calculate. The difference between RF signal input in dBm, and IF signal output also in dBm, is the gain (or (...)
If the internal transistors of the Gilbert cell mixer are not biased to work in saturation (and in SA612 case, they are not) is preferable to drive the mixer at the LO input using a sine wave signal. There are many switching-type mixers where is mandatory to use square LO signal, but this is (...)
The post is insonsistent regarding intended circuit function. It's also unclear how the waveform has been acquired. I think, the mixer circuit can be also described as an AM modulator because part of the output signal is a product of both input signals, but only a small part.
In additional to the comment above, Check also LO driving signal amplitude to prevent self-mixing due to limited LO-RF isolation.If this amplitude becomes very high, LO mixes with itself at the RF input then it can generate a modulation by some phse shift.
The result is that both components, RF and LO are multiplied in a mixer, and the IF input contains the result of this product. If you need a clean translation of the "high" RF signal in the "low" IF output, use the best LO oscillator you can find. Otherwise by applying a dirty LO you get a dirty IF output. Oscillator noise problems has bee (...)
Hi there. I want to use a frequency mixer with a LO power of 6 dBm and an expected RF input of -60 dBm. If the specified LO-RF isolation is 35 dB, what would be the effect of this insufficient isolation? Would there still be an IF output of |Frf-Flo| at a lower power or would this not be seen at all? Thanks
Due to limited selectivity of the RF filters, RF gain can't be arbitrarily high, otherwise off-band components could cause amplifier and mixer overload. So if you plan higher RF gain, you have to check that the signal is keeping the linear range in every part of the receiver. When we said that the RF amp has input power is -110dB
i don't think that a superhet with an IF of 455kHZ will work with an input signal of 457 kHZ. If it is going to be for a fixed (457 kHZ) reception only, I would use a domestic superhet with the mixer/oscillator re-configured as an RF amp. Get an old one with IF transformers and not fixed ceramic filters (can't change the frequency of (...)
Hi ! I am making an RF Transmitter and i have a problem with power leakage for LO port to IF port and RF port. I don't know what to do and i am little confused about how can i fix this. Source(-10 or -20dBm) 10KHz --------->mixer conv.loss=8db--------->RF port and L.O=70MHz and 7dbm I put an oscilloscope to mixers input IF and i (...)
I may want to use my spectrum analyzer for the job. The noise source operates with a pulsed input only, or can i apply a constant 28V DC to produce the hot noise?