Delay compensation apparatus

1. A delay compensation apparatus, comprising a first channel delay unit and a second channel delay unit, wherein the first channel delay unit is serially connected on a first channel, the second channel delay unit is serially connected on a second channel, and a delay of an input signal to the first channel is less than a delay of an input signal to the second channel, wherein:

the first channel delay unit comprises a surface acoustic unit, and the surface acoustic unit comprises a first surface acoustic wave component and a surface acoustic output selection switch; the first surface acoustic wave component comprises an input end and p output ends, wherein p≥2; signal delay differences between the p output ends of the first surface acoustic wave component and the input end of the first surface acoustic wave component form an arithmetic progression whose first term is absolute delay duration T 0 and whose common difference is relative delay duration t 0 ;

the input end of the first surface acoustic wave component is used as a signal input end of the surface acoustic unit, and the surface acoustic output selection switch selects one output end of the p output ends of the first surface acoustic wave component as a signal output end of the surface acoustic unit; and

delay duration of the second channel delay unit is the absolute delay duration T 0 .

2. The apparatus according to claim 1 , wherein the first channel delay unit further comprises q delay line units, wherein the surface acoustic unit is serially connected to the q delay line units, and two ends of the serial connection are respectively used as a signal input end and a signal output end of the first channel delay unit; and

each delay line unit comprises a delay line, a transmission component, an input selection switch, and an output selection switch, wherein the input selection switch selects one end of the delay line or one end of the transmission component as a signal input end of the delay line unit, the output selection switch selects another end of the delay line or another end of the transmission component as a signal output end of the delay line unit, and delay duration of the transmission component is less than specified duration.

3. The apparatus according to claim 2 , wherein the transmission component is a resistance attenuator.

4. The apparatus according to claim 2 , wherein

q =ceil(log 2 t 0 ).

5. The apparatus according to claim 2 , wherein a sum t of delay duration of delay lines in the q delay line units is:

t =ceil( t 0 )−1.

6. The apparatus according to claim 5 , wherein delay duration t i of a delay line in an i th delay line unit of the q delay line units is:

t i =2 i−1 , where 1≤i≤q−1; or

t i =t− ( t 1 +t 2 + . . . +t q−1 ), where i=q.

7. The apparatus according to claim 1 , wherein

t 0 =a/f,

wherein a is an integer greater than or equal to 1, and f is a center working frequency of the first surface acoustic wave component.

8. The apparatus according to claim 1 , wherein

p =floor( T/t 0 )+1;

wherein T is an expected maximum compensation value, and T≥t 0 .

9. The apparatus according to claim 1 , wherein the second channel delay unit is a second surface acoustic wave component, the second surface acoustic wave component comprises an input end and an output end, and a signal delay difference between the output end of the second surface acoustic wave component and the input end of the second surface acoustic wave component is the absolute delay duration T 0 .