الفهرس 
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Abstract
Recent efforts in the design of frequency division duplex (FDD) RF front-end
transceivers are carried out to reduce the- distortion created by the transmitted signal
leakage through the receiving path. In this thesis, an active filtering technique, used to
inhibit the transmitted leakage signal, is presented. Tn this technique, the front-end
surface acoustic wave (SAW) filter is replaced by an active on-chip band pass filter.
The filtering technique is based on using a band pass sink filter to selectively tilter the
transmitted leakage signal out before the down-conversion mixer while not affecting
the desired signal gain. To increase the signal-to-leakage ratio, the sink filter must have
a high input impedance at the receiving signal (RX) frequency and a low input
impedance at the transmitted leakage signal (TX) frequency to significantly absorb the
transmitted signal leakage.
The proposed sink filter consists of a passive auxiliary mixer operating at TX
frequency cascaded with an auxiliary trans-impedance amplifier (TIA). The input
impedance levels of the proposed sink filter is achieved based on the impedance
translation concept of the passive mixer. According to this concept, the input
impedance of the auxiliary TIA is scaled and frequency translated around the operating
frequency of the auxiliary mixer.
The proposed trans-impedance amplifier is comprised of a fully differential folded
cascode amplifier, followed by an inverter as an output stage to increase the loop gain.
The operating point of the inverter is chosen carefully such that, both N-MOS and P-
MOS transistors operate in the saturation region to achieve the maximum gain. A unity
feedback is used to decrease the de-input impedance of the proposed TLA. Hence, a
higher signal-to leakage ratio could be achieved. A complete design algorithm of the
proposed TIA is introduced. Under typical conditions, the proposed fully differential
ABSTRACT
Ahmed Wahba Abd-allah El-Saied, Design A Mixing Technique for Snw Less
RF Receiver,
master of Science Dissertation, Zagazig University, Zagazig, 2015.
Recent efforts in the design of frequency division duplex (FDD) RF front-end
transceivers are carried out to reduce the- distortion created by the transmitted signal
leakage through the receiving path. In this thesis, an active filtering technique, used to
inhibit the transmitted leakage signal, is presented. In this technique, the front-end
surface acoustic wave (SAW) filter is replaced by an active on-chip band pass filter.
The tiltering technique is based on using a band pass sink filter to selectively tilter the
transmitted leakage signal out before the down-conversion mixer while not affecting
the desired signal gain. To increase the signal-to-leakage ratio, the sink filter must have
a high input impedance at the receiving signal (RX) frequency and a low input
impedance at the transmitted leakage signal (TX) frequency to significantly absorb the
transmitted signal leakage.
The proposed sink filter consists of a passive auxiliary mixer operating at TX
frequency cascaded with an auxiliary trans-impedance amplifier (TIA). The input
impedance levels of the proposed sink filter is achieved based on the impedance
translation concept of the passive mixer. According to this concept, the input
impedance of the auxiliary TIA is scaled and frequency translated around the operating
frequency of the auxiliary mixer.
The proposed trans-impedance amplifier is comprised of a fully differential folded
cascode amplifier, followed by an inverter as an output stage to increase the loop gain.
The operating point of the inverter is chosen carefully such that, both N-MOS and P-
MOS transistors operate in the saturation region to achieve the maximum gain. A unity
feedback is used to decrease the de-input impedance of the proposed TlA. Hence, a
higher signal-to leakage ratio could be achieved. A complete design algorithm of the
proposed TIA is introduced. Under typical conditions, the proposed fully differential .