Perhaps they might be associated with the collector-emitter current gains of the transistors?adamaero said:
Conversion gain for a mixer is a measure of the ability of the device to convert the input RF signal to the desired intermediate frequency (IF) output signal. It is expressed in decibels (dB) and represents the ratio of the output signal power to the input signal power.
Conversion gain is calculated by taking the logarithm of the ratio of the output power to the input power and multiplying it by 10. This is expressed as: Conversion Gain (dB) = 10 * log (Pout/Pin).
The conversion gain of a mixer is affected by various factors such as the frequency of the input and output signals, the power level of the input signal, the type of mixer (e.g. single-balanced, double-balanced), and the quality of the components used in the mixer.
A BJT (Bipolar Junction Transistor) switch is a common type of switch used in mixers. It can affect the conversion gain by introducing additional losses in the signal path, which can reduce the overall conversion gain of the mixer. However, BJT switches are typically designed to minimize these losses and maintain high conversion gain.
Conversion gain is an important parameter for mixers because it determines the efficiency and performance of the device. A higher conversion gain means that the mixer is able to convert more of the input signal power to the desired IF output signal, resulting in better sensitivity and overall performance of the system. It also affects other parameters such as noise figure and dynamic range of the mixer.
