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Modem PPT

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Published in: Effective Communication | Electronics
5,503 Views

Modem - Introduction  PPT

Mishal A / Noida

33 years of teaching experience

Qualification: B.Tech/B.E. (BIT MESRA - 2014)

Teaches: All Subjects, Chemistry, Computer Science, Mathematics, Physics

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  1. Architecture PART I
  2. Base Band Processor A baseband processor is a device in a network interface that manages all the radio functions. converts the data to a signal that can be used to modulate the carrier frequency for transmission and vice versa. That signal is then handed off to the RF processor, which may also be a part of the baseband chip. In XMM-7560 the base band processor is X-GOLDTM 756
  3. RF Front-End the RF front end is a generic term for all the circuitry between the antenna up to and including the mixer stage. For a receiver, inclUdes: all the filters low-noise amplifiers (LNAs) down-conversion mixer : process the modulated signals received at the antenna into signals suitable for input into the baseband analog-to-digital converter (ADC). Considering the above sub points RF front end is often called the analog-to- digital or RF-to-baseband portion of a receiver.
  4. The following figure shows a Super- heterodyne receiver Filter Amplifier Mixer LO Os IF Amplifier Audio & Fi Iter Demodulator Amplifier illator
  5. SMARTI' Inter 6255 SMARTio• UE2p Transceiver C tup X-GOLDO' 625 Baseband Processor Chip RF Transceiver Power Amplifier
  6. ž iläVV?S iläVVVS uuvws
  7. SMART!' 7 ' It is a RF transceiver. Supports LTE/HSPA/TD-SCDMA/CDMA/GSM/GNSS The main features of SMART i 7 are as follows - Two DigRF interfaces for 2G, 3G and LTE data and RF control - One UL chain with support for 2 CC. - 5 DL chains - Integrated GNSS.
  8. SMARTi 7u It is a RF transmitter. It provides the Secondary UL (Uplink chain).
  9. DigRF DigRF is working group was formed as a MIPI Alliance. Focuses on developing specifications for wireless mobile RFIC to base- band IC (BBIC) interfaces in mobile devices. The group's current charter is split into short-term and long-term efforts The DigRF working group was formed as a MIPI Alliance (MIPI) working group in April 2007
  10. MIPI Alliance MIPI => Mobile Industry Processor Interface It is a global, open membership organization that develops interface specifications for the mobile ecosystem. It was founded in 2003 by ARM, Intel, Nokia, Samsung, STMicroeIectronics and Texas Instruments.

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