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IoT > L3 > Flashcards

L3 Flashcards

1
Q

Main properties of chipless RFID tags

A
  • need to maximize power absorption
  • use a rectifier circuit to convert incoming RF signal from reader into DC
  • reader keeps on transmitting a continuous-wave signal to interrogate the tag
  • tag reflects signal back after modulation
  • employ amplitude or phase shift keying
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2
Q

name modulation techniques used in chipless RFID systems and draw schematic (L3 4,5)

A
  • Amplitude shift keying (ASK)
  • On-off keying (OOK)
  • Phase shift keying (PSK)
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3
Q

draw simplified circuit of how ASK and PSK can be implemented (L3 6,7)

A

write on paper

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4
Q

basic concept of backscatter modulation

A
  • based on switching between two different impedance states using two complex impedances
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5
Q

draw basic backscatter modulation scenario (L3 9)

A

write on paper

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6
Q

write radar cross section equation and explain main idea (L3 10)

A
  • the main idea is to have the two states of the signal as separated as possible, lambda1 and lambda2 are very different. The best way is to have capacitive and inductive impedances.
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7
Q

How can BER be maximized?

A

by maximizing the power absorption vy the tag

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8
Q

draw L-section matching networks (L3 15)

A

write on paper

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9
Q

draw series-parallel and parallel-parallel ASK and PSK configurations (L3 16) include antenna and rectifier (17)

A

write on paper

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10
Q

analyse operation of series-parallel ASK modulator (L3 18-20)

A
  • when switch is open, tag resembles a purely-resistive circuit. Complete absorption of power from antenna by rectifier occurs
  • when switch is closed, tag resembles a purely-reactive circuit
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11
Q

Define BER and equation in backscatter ASK modulation (L3 22)

A
  • BER is energy per bit over noise level
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12
Q

Main properties of PSK backscatter modulation

A
  • information represented via phase difference
  • phase angle must be maximized maintaining constant power magnitude
  • realized by introducing complex impedance and complex conjugate right after antenna
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13
Q

draw basic PSK backscatter modulator diagram (L3 27)

A

write on paper

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14
Q

draw series-series PSK modulator (L3 29) and main properties

A
  • modulator is assumed to operate beyond resonance
  • magnitude of reflection coefficient must be constant otherwise amplitude modulation occurs
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15
Q

impedance representation of the two states of series series PSK modulator (L3 32)

A

write on paper

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16
Q

alternative to PSK backscatter modulation and reason to be used

A
  • can be difficult to achieve exact 180° modulation angle in PSK backscatter
  • pseudo-PSK backscatter

IoT (10 decks)

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