Sharif Digital Repository

Removing SAW filter from the input of a receiver makes the receiver extremely vulnerable to all sorts of blockers and interferers. It is shown in this thesis that due to existing large out-of-band blockers the linearity of the saw-less receiver has to be considerably higher than that of the conventional receivers with input SAW filter. These ever-present and unwanted signals that show up in the absence of the input SAW filter are divided into two groups of far and near out-of-band blockers and interferers. It is shown that removing these groups of unwanted signals require two distinct approaches, one for near and the other for the far out-of-band blockers. An inclusive solution to protect... 

In this thesis, a modified method based on frequency discriminator technique is presented for measuring phase noise of microwave oscillators. In the proposed method, the phase shifter is omitted. In contrast, a 90° hybrid with one more channel containing a phase detector, and an LNA is added to the measurement setup. It can be said that an I/Q phase noise detection has been developed. With the proposed method, tuning of the variable phase shifter is not needed anymore. Therefore, the measurement is done automatically and as a result the measurement time is decreased. Beside the wideband property of the new technique, another considerable advantage is that the method is theoretically self...