By Pui-In Mak, Ben U Seng Pan, Rui Paulo Martins
With the prior few decade efforts on lithography and integrated-circuit (IC) applied sciences, very reasonably cheap microsystems were effectively constructed for lots of various functions. the fad in instant communications is towards making a networkubiquitous period within the years yet to come. Many remarkable possibilities and demanding situations, resembling layout for multi-standardability and low-voltage (LV) compliance, are swiftly turning into the mainstream instructions in wireless-IC study and improvement, on condition that the previous can provide the easiest connectivity between assorted networks, whereas the latter can facilitate the expertise migration into the sub-1-V nanoscale regimes for additional price and tool aid.
Analog-Baseband Architecturees and Circuits presents architectural and circuit suggestions for instant transceivers to accomplish multistandard and low-voltage compliance. the 1st a part of the booklet stories the actual layer requisites of contemporary instant verbal exchange criteria, offers the elemental tradeoffs all for transceiver structure choice, and offers case reports of the cutting-edge multistandard transceivers, the place the most important options strengthened are highlighted and mentioned. A statistical precis (with a hundred+ references brought up) of such a lot used transmitter and receiver architectures for contemporary conversation criteria is supplied. the entire references are citied from the best boards, i.e., ISSCC, CICC, VLSI and ESSCIRC, from 1997 to 2005.
The moment half makes a speciality of the architectural layout of multistandard transceivers. A coarse-RF fine-IF (two-step) channelselection approach is disclosed. It, throughout the reconfiguration of receiver and transmitter analog basebands, allows not just a rest of the RF frequency synthesizer’s and native oscillator’s layout necessities, but in addition an effective multistandard compliance via synthesizing the low-IF and zero-IF within the receiver; and the direct-up and two-step-up within the transmitter. the primary is confirmed in few layout examples. one in every of them is a system-in-a-package (SiP) receiver analog baseband for IEEE 802.11a/b/g WLAN. It not just has the two-step channel choice embedded, but additionally includes a flexible-IF topology, a special 3D-stack floorplan, and a selected layout technique for top testability and routability.
The 3rd half offers with the circuit layout. as well as the methodical description of many LV circuit strategies, three tailormade LV-robust sensible blocks are provided. They contain: 1) a double-quadrature-downconversion clear out (DQDF) – it realizes at the same time clock-rate-defined IF reception, I/Q demodulation, IF channel choice and baseband filtering. 2) A switched-current-resistor (SCR) programmable-gain amplifier (PGA) – it deals a transient-free constant-bandwidth achieve adjustment. three) An inside-OpAmp dc-offset canceler – it saves the silicon region required for figuring out a wide time consistent on chip whereas maximizing its highpass-pole switchability for quick dc-offset transient.
The final half provides experimental result of the three tailored construction blocks and a fully-integrated analog-baseband IC fabricated in a standard-VTH CMOS method. formerly untold on-/off-chip co-setup for either full-chip and construction blocks measurements are defined. not just the development blocks have effectively prolonged the cutting-edge boundary by way of sign bandwidth and provide voltage, the analog-baseband IC has been up to now the lowest-voltage-reported answer for IEEE 802.11a/b/g WLAN receivers.
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Extra info for Analog-Baseband Architectures And Circuits For Multistandard And Lowvoltage Wireless Transceivers
70] are also proved to be feasible since the frequency synthesizer can generate a constant-amplitude GFSK channel without a separated TX path. 4-GHz ISM band, being the exception the channel bandwidth that is 5 MHz for a higher data rate of 5 Mb/s. Many characteristics of HomeRF align with Bluetooth. With a bandwidthtunable baseband, a Bluetooth solution can be reused for HomeRF. 12], is another low-cost wireless technology. 4GHz ISM band, delivering a data rate up to 250 kb/s. 78]. Consistent to our previous considerations, its narrowband nature recommends the use of a low-IF RX together with a direct-up TX.
11a T. Rühlicke et al. 5 mm2 –- –74 dBm 600 mW 465 mW ––85 dBm 345 mW 330 mW –74 dBm 345 mW 330 mW high/low gain, *: no A/D and D/A, +: 54 Mb/s for a, g 11Mb/s for b SUMMARY We have summarized in this chapter some essential information that is worth considering during transceiver architecture selection. Some general conclusions are drawn below: Architecturally, to meet the goals of low power and low cost as well as high integration and multistandard compliance, the superheterodyne architecture should be avoided.
2], which employs a fixed-frequency LO incorporated with a wideband lowpass filter (LPF) in the first down-conversion, whereas the channel selection is shifted to the IF. In this way, the operating frequency of the succeeding stages is reduced, but this benefit comes at the expense of an increased linearity requirement from the wide-band LPF to prevent channel-to-channel intermodulation. (b) Figure 3-1.
Analog-Baseband Architectures And Circuits For Multistandard And Lowvoltage Wireless Transceivers by Pui-In Mak, Ben U Seng Pan, Rui Paulo Martins