By Keh-La Lin, Armin Kemna, Bedrich J. Hosticka
One of the most traits of microelectronics is towards layout for built-in platforms, i.e., system-on-a-chip (SoC) or system-on-silicon (SoS). because of this improvement, layout recommendations for mixed-signal circuits turn into extra vital than ahead of. between different units, analog-to-digital and digital-to-analog converters are the 2 bridges among the analog and the electronic worlds. in addition to, low-power layout method is among the major concerns for embedded structures, specifically for handheld applications.
Modular Low-Power, High-Speed CMOS Analog-to-Digital Converter for Embedded Systems goals at layout concepts for low-power, high-speed analog-to-digital converter processed through the normal CMOS know-how. also this ebook covers actual integration problems with A/D converter built-in in SoC, i.e., substrate crosstalk and reference voltage community layout.
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Extra info for Modular low-power, high-speed CMOS analog-to-digital converter of embedded systems
3 25 Other Specifications Tuning range: A wireless transceiver uses predefined frequency bands to transmit and receive, which must be accommodated by the frequency synthesizer. e. the frequency range that can be synthesized, is mainly determined by the tuning range of the VCO. Integratability: is the measure of how well the synthesizer can be integrated. The typical integratability bottlenecks in high-quality synthesizer design are the high Q inductor and the loop filter capacitance. In order for the PLL to occupy a moderate area, the integrated capacitance of the loop filter must be minimized while maintaining the required dynamic behavior and phase noise performance.
The most classical example is the Wien-bridge oscillator [Sen89]. More exotic, high frequency oscillator types, which do not qualify for silicon integration exist such as Dielectric Resonance Oscillators (DRO), Yttrium Iron Garnet (YIG),... 4 The Frequency Divider The frequency divider is together with the oscillator, the only part of the PLL frequency synthesizer that operates at high frequency. It converts the high oscillator output frequency to lower frequency which can be compared to the clean Xtal reference source.
The implementation details of the receiver can be found in [Jans02]. The transmit path is implemented by a direct conversion transmitter, which provides the most integrated solution, since it does not require high-Q interstage filtering. The implementation details of the transmitter are elaborately discussed in [Borr02]. A complete DCS-1800 cellular system can be built by flanking the transceiver IC by a minimum number of external components: a duplexer, a power amplifier, a Xtal oscillator and a digital CMOS baseband chip (see Fig.