Switching device of digital amplifier and method for driving the same
AssigneeNeofidelity, Inc.
InventorsYeongha Choi, Minsoo Kim, Sungil Kim, Seokil Jeong
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Abstract
A switching device of a digital amplifier and a method for controlling the same are disclosed. In accordance with the present invention, a linearity is maintain even for a short pulse width since a data signal having a pulse width shorter than a predetermined length. Moreover, when an MLP signal is located at both sides of a compensating signal without overlapping with each other, a problem due to a common mode may be prevented.
Claims14
A switching device for driving a load according to a data signal included in a frame of a PWM signal, comprising:
- a controller for outputting an MLP signal;
- and a first compensating signal when [data]≦[MPC] is satisfied, wherein a pulse width of the first compensating signal is sum of [data] and [MLP], a second compensating signal;
- and a third compensation signal when [MPC]<[data]≦([MPC]+[MLP]) is satisfied, wherein a pulse width of the second compensation signal is a sum of [MPC] and [MLP], and a pulse width of the third compensation is [MLP]−([data]−[MPC]);
- and
- a switch module for performing a switching operation according to the MLP signal, the first compensating signal, the second compensating signal and the third compensating signal (where [MPC] is a reference pulse width, [data] and [MLP] are pulse widths of the data signal and the MLP signal, respectively).
A method for driving a switching device driving a load according to a data signal included in a frame of a PWM signal, the method comprising steps of:
- (a) determining whether [data]≦[MPC] is satisfied;
- (b) outputting an MLP signal;
- and a first compensating signal when [data]≦[MPC] is satisfied, wherein a pulse width of the first compensating signal is sum of [data] and [MLP];
- (c) performing a switching operation according to the MLP signal and the compensating signal outputted in the step (b);
- (d) determining whether [MPC]<[data]≦[MPC]+[MLP] is satisfied;
- (e) outputting a second compensating signal;
- and a third compensating signal when [MPC]<[data]≦[MPC]+[MLP] is satisfied, wherein a pulse width of the second compensating signal is sum of [MPC] and [MLP], and a pulse width of the third compensating signal is [MLP]−([data]−[MPC]);
- and
- (f) performing the switching operation according to the second compensating signal and the third compensating signal outputted in the step (e) (where [MPC] is a reference pulse width, [data] and [MLP] are pulse widths of the data signal and the MLP signal, respectively).
Dependencies are inferred from the claim text.