The noise of paralleled linear amplifiers is comprehensively treated, and practical methods of calculating noise parameters and predicting noise behavior of paralleled amplifiers are shown in comparison with their component single amplifier. Sometimes the paralleling technique can be used to improve the signal-to-noise ratio of the first-stage amplifier. It is shown that paralleling amplifiers does not always improve the signal-to-noise ratio. Conditions for improving the signal-to-noise ratio are shown. As an example, noise parameters, such as noise figure and optimum source impedance, of paralleled field effect transistors are calculated from the device parameters of their component field effect transistors. Calculated and measured values are compared with those of the single field effect transistor.
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members and is free for AES members and E-Library subscribers.