What is a frequency blender?
The frequency blender is a non -linear or multiplication electrical circuit that is able to produce a continuous sum and different frequencies of two or more input signals. The equipment is widely used in telecommunications and receiving. Mathematical sinus signals have additive and subtractive effects on the resulting frequencies. For example, in a common SuperHeterodyne receiver, the frequency blender inputs are a radio frequency (RF) signal (RF), which is an incoming and local signal of the oscillator (LO) and the resulting sum or the difference between both inputs is the middle frequency (IF). In addition to the frequencies of the sum and the difference, there are other outputs in smaller amplitudes, including harmonious or higher or higher order.
The use of the IF stages of the amplifier simplifies the first RF amplifying phase of the receiver. Usually, only one front-end phase must be tuned across the receiver belt. The rest of the RF amplifiers after a frequency blender is tuned only on IF. A special blender called Subharmonic Mixer canEnter the frequency of LO, which is half the required frequency, passes through a non -linear device and effectively generates LO for double original frequency.
When vacuum tubes or triodes were used, the grid between the cathode and the anode was able to control the flow of electrons. The correct design was the TRIODA was able to amplify the RF signals and oscillate due to the right passive tuned tanks as a reference frequency. Trimoda was developed to have more than one control grid. At the beginning of the 20th century, the Pentagrid converter was used as a frequency blender, where a trio with four other grids performed an amplifier, an oscillator and a blender, resulting in a front-end for receivers.
The ring modulation allows the use of transformers and the bridge diode configuration to create the desired multiplication of the thou and the frequency of the carrier. The result is a frequency spectrum, with the report shifting higherin a frequency of quantity equal to the supporting frequency. On the receiver side, the product detector can be used to enter a modulated carrier and reference frequency to restore the original message.
Gilbert cell is a bipolar transistor circuit that uses current profit of direct bound bipolar transistor stages to create the required analog multiplication to create the frequency mixer outputs. The first input signal is fed to the basic terminals of two transistors working as a differential pair, while the second input is fed to the basic terminals of two differential pairs of transistors with emitters that provide collector currents for differential pair for the first input signal. The resulting output is available at differential pairs for the second input signal.
A frequency blender can also function as a multiplier frequency. If the same signal is fed to the frequency blender input, the output frequency includes integer multiplesEntrance frequency. The second and third accordions will be available at the ascent, with the second harmonious to be higher than the third harmonic.