By Michiel Steyaert, Arthur H.M. van Roermund, Johan Huijsing
Analog Circuit layout is a vital reference resource for analog circuit designers and researchers wishing to maintain abreast with the most recent improvement within the box. the academic insurance additionally makes it compatible to be used in a sophisticated layout direction.
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Additional info for Analog Circuit Design: RF Circuits: Wide band, Front-Ends, DAC's, Design Methodology and Verification for RF and Mixed-Signal Systems, Low Power and Low Voltage
The output of the bandpass filter is amplified by a VGA to the optimal input range for the A/D converters. Further filtering is done in the digital domain. 31 The digital part demodulates the GFSK coded bit stream by evaluating the phase information in the I and Q signals. The digital part recovers the receive bit clock. It also extracts RSSI data by calculating the signal strength and uses this information to control the overall gain amplification in the receive path. The transmitter takes the serial input transmit data from the base-band processor.
The large capacitance on this node is shielded from node N9 by cascode transistor M11. The use of this cascode is vital as the capacitance on node N9 must be low in order to increase the SFDR. This is can be seen in equation 20. Transistors M9 and M10 are switches. Transistors M7 and M8 are the cascodes above the switches. Transistors M1-M6 and inverters I1-I2 compose the drivers of the switches. 60 Fig. 14. Basic scheme of our current-steering DAC. The structure is very simple and uses no bootstrapping, no gain-boosting and no feedback.
The pMOS added current is eliminated by nMOS DC current sources avoiding the current to be amplified to the mixer. A lot of attention has been paid on the matching of these nMOS and pMOS currents. The programmable current amplifier causes some degradation of the linearity, mainly due to the parasitic capacitance in the current mirror which are a consequence of the large size of the transistors. Note that the Early effect is nondominant thanks to the long device lengths used. The third order baseband harmonic is directly up-converted in the mixer to LO3BB.