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ADAR2001ACCZ 数据表(PDF) 20 Page - Analog Devices |
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ADAR2001ACCZ 数据表(HTML) 20 Page - Analog Devices |
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20 / 39 page  ADAR2001 Data Sheet Rev. 0 | Page 20 of 39 MULTICHANNEL FREQUENCY SWEEP Figure 31 shows an example of how the two state machines can be used to perform a multichannel frequency sweep from 20 GHz to 40 GHz (that is, sweep through a frequency range while on one channel, move to the next channel, and repeat the sweep). In this example, because both MULT_STATES (Register 0x018, Bits[3:0]) and TX_STATES (Register 0x017 Bits[6:0]) are 0 indexed, MULT_STATES is defined as 2 because there are three states inside the multiplier/filter loop and TX_STATES as 3 because there are four states inside the transmitter loop. As shown in Figure 31, • Multiplier/Filter State 0 = sleep (outside the loop) • Multiplier/Filter State 1 = output 20 GHz to 25 GHz to PAs • Multiplier/Filter State 2 = output 25 GHz to 30 GHz to PAs • Multiplier/Filter State 3 = output 30 GHz to 40 GHz to PAs • Transmit State 0 = sleep (outside the loop) • Transmit State 1 = transmit on Channel 1 • Transmit State 2 = transmit on Channel 2 • Transmit State 3 = transmit on Channel 3 • Transmit State 4 = transmit on Channel 4 Reset pulses on TxRST and MRST put both state machines in their initial states, which in this case are defined as sleep modes. Pulses on MADV and TxADV then advance both state machines to their first active state. In this example, an initial ready state is skipped, and the circuit goes directly from sleep mode to active mode. Additional pulses on MADV are applied as the frequency is swept. Multiplier ready modes are used to ensure the fastest switching of the multiplier/filter circuitry. After the frequency sweep is completed on Channel 1, both MADV and TxADV are pulsed to put the multiplier/filter back into its first state and the transmitter switches the active channel from 1 to 2. Then, the frequency sweep repeats itself using repeated pulses on the MADV pin. In this example, after the four channels are frequency swept, both state machines loop back to their first active state. In a large array, it is recommended to loop them back to a sleep or ready state to wait for their turn to transmit again. SEQUENCER SLEEP CONTROL To further simplify the control of the ADAR2001, it is possible to link the sleep states of the two state machines so that one sequencer going to sleep forces the other to sleep as well. This link helps to limit the total number of required states to achieve a desired type of operation. To use this feature, one of the two sleep control bits must be set, but not both. MULT_STATE_0 TX_STATE_0 MULT: ALL SLEEP BPF: N/A PA: ALL SLEEP SLEEP MULTIPLIER RESET TRANSMITTER RESET MULTIPLIER ADVANCE TRANSMITTER ADVANCE MULT: MID ACT BPF: HIGH PA: CH. 1 ACT CHANNEL 1 20GHz TO 25GHz MULT_STATE_1 TX_STATE_1 MULT: HIGH ACT BPF: LOW PA: CH. 1 ACT CHANNEL 1 25GHz TO 30GHz MULT_STATE_2 TX_STATE_1 MULTIPLIER ADVANCE MULTIPLIER ADVANCE MULTIPLIER ADVANCE MULTIPLIER ADVANCE MULTIPLIER ADVANCE MULTIPLIER ADVANCE MULTIPLIER ADVANCE MULTIPLIER ADVANCE MULTIPLIER ADVANCE MULT: HIGH ACT BPF: HIGH PA: CH. 1 ACT CHANNEL 1 30GHz TO 40GHz MULT_STATE_3 TX_STATE_1 MULT: MID ACT BPF: HIGH PA: CH. 2 ACT CHANNEL 2 20GHz TO 25GHz MULT_STATE_1 TX_STATE_2 MULT: HIGH ACT BPF: LOW PA: CH. 2 ACT CHANNEL 2 25GHz TO 30GHz MULT_STATE_2 TX_STATE_2 MULT: HIGH ACT BPF: HIGH PA: CH. 2 ACT CHANNEL 2 30GHz TO 40GHz MULT_STATE_3 TX_STATE_2 TRANSMITTER ADVANCE MULTIPLIER ADVANCE TRANSMITTER ADVANCE MULTIPLIER ADVANCE TRANSMITTER ADVANCE MULTIPLIER ADVANCE TRANSMITTER ADVANCE MULT: MID ACT BPF: HIGH PA: CH. 3 ACT CHANNEL 3 20GHz TO 25GHz MULT_STATE_1 TX_STATE_3 MULT: HIGH ACT BPF: LOW PA: CH. 3 ACT CHANNEL 3 25GHz TO 30GHz MULT_STATE_2 TX_STATE_3 MULT: HIGH ACT BPF: HIGH PA: CH. 3 ACT CHANNEL 3 30GHz TO 40GHz MULT_STATE_3 TX_STATE_3 MULT: MID ACT BPF: HIGH PA: CH. 4 ACT CHANNEL 4 20GHz TO 25GHz MULT_STATE_1 TX_STATE_4 MULT: HIGH ACT BPF: LOW PA: CH. 4 ACT CHANNEL 4 25GHz TO 30GHz MULT_STATE_2 TX_STATE_4 MULT: HIGH ACT BPF: HIGH PA: CH. 4 ACT CHANNEL 4 30GHz TO 40GHz MULT_STATE_3 TX_STATE_4 Figure 31. State Machine Loop Example for 4-Channel Frequency Sweep |
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